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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1501.07243 | Walter Simon | Maria Eugenia Gabach Clement, Martin Reiris and Walter Simon | The area-angular momentum inequality for black holes in cosmological
spacetimes | 24p; minor corrections to v1 | null | null | null | gr-qc math.DG math.FA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For a stable marginally outer trapped surface (MOTS) in an axially symmetric
spacetime with cosmological constant $\Lambda > 0$ and with matter satisfying
the dominant energy condition, we prove that the area $A$ and the angular
momentum $J$ satisfy the inequality $8\pi |J| \le A\sqrt{(1-\Lambda
A/4\pi)(1-\Lambda A/1... | [
{
"created": "Wed, 28 Jan 2015 19:12:51 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Feb 2015 15:22:28 GMT",
"version": "v2"
}
] | 2015-02-12 | [
[
"Clement",
"Maria Eugenia Gabach",
""
],
[
"Reiris",
"Martin",
""
],
[
"Simon",
"Walter",
""
]
] | For a stable marginally outer trapped surface (MOTS) in an axially symmetric spacetime with cosmological constant $\Lambda > 0$ and with matter satisfying the dominant energy condition, we prove that the area $A$ and the angular momentum $J$ satisfy the inequality $8\pi |J| \le A\sqrt{(1-\Lambda A/4\pi)(1-\Lambda A/12\... |
2101.00493 | Jarmo M\"akel\"a Dr. | Jarmo M\"akel\"a | Brown-York Energy in Spacetimes with Horizon | 5 pages, no figures. Accepted for publication in the Physical Review
D | null | 10.1103/PhysRevD.103.026002 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We obtain a simple relationship between the change in the Brown-York energy
inside of a closed two-surface just outside of a horizon of spacetime, and the
change in the area of that two-surface.
| [
{
"created": "Sat, 2 Jan 2021 18:41:26 GMT",
"version": "v1"
}
] | 2021-02-03 | [
[
"Mäkelä",
"Jarmo",
""
]
] | We obtain a simple relationship between the change in the Brown-York energy inside of a closed two-surface just outside of a horizon of spacetime, and the change in the area of that two-surface. |
1511.08835 | Miguel Sabido | M. Sabido and C. Yee-Romero | Deformed Phase Space Kaluza-Klein cosmology and late time acceleration | 5 pages, 2 figures, RevTeX 4.1 | null | 10.1016/j.physletb.2016.03.036 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The effects of phase space deformations on Kalutza-Klein cosmology are
studied. The deformation is introduced by modifying the symplectic structure of
the minisuperspace variables. In the deformed model, we find an accelerating
scale factor and therefore infer the existence of an effective cosmological
constant from ... | [
{
"created": "Fri, 27 Nov 2015 21:59:06 GMT",
"version": "v1"
}
] | 2016-03-30 | [
[
"Sabido",
"M.",
""
],
[
"Yee-Romero",
"C.",
""
]
] | The effects of phase space deformations on Kalutza-Klein cosmology are studied. The deformation is introduced by modifying the symplectic structure of the minisuperspace variables. In the deformed model, we find an accelerating scale factor and therefore infer the existence of an effective cosmological constant from th... |
2012.08352 | Shahar Hod | Shahar Hod | Further evidence for the non-existence of a unified hoop conjecture | 11 pages | The European Physical Journal C 80, 982 (2020) | 10.1140/epjc/s10052-020-08558-8 | null | gr-qc astro-ph.HE hep-th | http://creativecommons.org/licenses/by/4.0/ | The hoop conjecture, introduced by Thorne almost five decades ago, asserts
that black holes are characterized by the mass-to-circumference relation $4\pi
{\cal M}/{\cal C}\geq1$, whereas horizonless compact objects are characterized
by the opposite inequality $4\pi {\cal M}/{\cal C}<1$ (here ${\cal C}$ is the
circumf... | [
{
"created": "Tue, 15 Dec 2020 15:12:42 GMT",
"version": "v1"
}
] | 2020-12-23 | [
[
"Hod",
"Shahar",
""
]
] | The hoop conjecture, introduced by Thorne almost five decades ago, asserts that black holes are characterized by the mass-to-circumference relation $4\pi {\cal M}/{\cal C}\geq1$, whereas horizonless compact objects are characterized by the opposite inequality $4\pi {\cal M}/{\cal C}<1$ (here ${\cal C}$ is the circumfer... |
2108.09930 | Farook Rahaman | Farook Rahaman, Ksh. Newton Singh, Rajibul Shaikh, Tuhina Manna and
Somi Aktar | Shadows of Lorentzian traversable wormholes | 12 pages, 7 figures. published in Class.Quan.Grav | Class. Quantum Grav. 38 (2021) 215007 | 10.1088/1361-6382/ac213b | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The prospect of identifying wormholes by investigating the shadows of
wormholes constitute a foremost source of insight into the evolution of compact
objects and it is one of the essential problems in contemporary astrophysics.
The nature of the compact objects (wormholes) plays a crucial role on shadow
effect, which... | [
{
"created": "Mon, 23 Aug 2021 04:43:26 GMT",
"version": "v1"
},
{
"created": "Sun, 31 Oct 2021 17:05:04 GMT",
"version": "v2"
}
] | 2021-11-02 | [
[
"Rahaman",
"Farook",
""
],
[
"Singh",
"Ksh. Newton",
""
],
[
"Shaikh",
"Rajibul",
""
],
[
"Manna",
"Tuhina",
""
],
[
"Aktar",
"Somi",
""
]
] | The prospect of identifying wormholes by investigating the shadows of wormholes constitute a foremost source of insight into the evolution of compact objects and it is one of the essential problems in contemporary astrophysics. The nature of the compact objects (wormholes) plays a crucial role on shadow effect, which a... |
2010.09224 | Jia-Xi Feng | Jia-Xi Feng, Fu-Wen Shu and Anzhong Wang | Rotations of the polarization of a gravitational wave propagating in
Universe | 35 pages, 9 figures,improvements to presentation, references added,
and new content added in appendix to comment about gauge invariance,
published version in Nuclear Physics B | Nuclear Physics B (2021) | 10.1016/j.nuclphysb.2021.115578 | null | gr-qc astro-ph.CO astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study the polarization of a gravitational wave (GW) emitted
by an astrophysical source at a cosmic distance propagating through the
Friedmann-Lema\^itre-Robertson-Walk universe. By considering the null geodesic
deviations, we first provide a definition of the polarization of the GW in
terms of the W... | [
{
"created": "Mon, 19 Oct 2020 04:55:41 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Oct 2021 02:54:31 GMT",
"version": "v2"
}
] | 2021-10-25 | [
[
"Feng",
"Jia-Xi",
""
],
[
"Shu",
"Fu-Wen",
""
],
[
"Wang",
"Anzhong",
""
]
] | In this paper, we study the polarization of a gravitational wave (GW) emitted by an astrophysical source at a cosmic distance propagating through the Friedmann-Lema\^itre-Robertson-Walk universe. By considering the null geodesic deviations, we first provide a definition of the polarization of the GW in terms of the Wey... |
1310.4771 | George F. R. Ellis | George F R Ellis | Astrophysical black holes may radiate, but they do not evaporate | 56 pages, 10 Figures, 4 Tables. Errors corrected, new references
added, new section and appendix. Basic argument and outcome unchanged | null | null | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper argues that the effect of Hawking radiation on an astrophysical
black hole situated in a realistic cosmological context is not total
evaporation of the black hole; rather there will always be a remnant mass. The
key point is that the locus of emission of Hawking radiation is not the
globally defined event ... | [
{
"created": "Thu, 17 Oct 2013 16:56:53 GMT",
"version": "v1"
},
{
"created": "Sun, 20 Oct 2013 06:05:14 GMT",
"version": "v2"
}
] | 2013-10-22 | [
[
"Ellis",
"George F R",
""
]
] | This paper argues that the effect of Hawking radiation on an astrophysical black hole situated in a realistic cosmological context is not total evaporation of the black hole; rather there will always be a remnant mass. The key point is that the locus of emission of Hawking radiation is not the globally defined event ho... |
1003.3421 | Daniel Vanzella | William C. C. Lima and Daniel A. T. Vanzella | Gravity-induced vacuum dominance | To appear in Phys. Rev. Lett. | Phys.Rev.Lett.104:161102,2010 | 10.1103/PhysRevLett.104.161102 | null | gr-qc astro-ph.SR hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been widely believed that, except in very extreme situations, the
influence of gravity on quantum fields should amount to just small,
sub-dominant contributions. This view seemed to be endorsed by the seminal
results obtained over the last decades in the context of renormalization of
quantum fields in curved s... | [
{
"created": "Wed, 17 Mar 2010 18:10:17 GMT",
"version": "v1"
}
] | 2010-05-12 | [
[
"Lima",
"William C. C.",
""
],
[
"Vanzella",
"Daniel A. T.",
""
]
] | It has been widely believed that, except in very extreme situations, the influence of gravity on quantum fields should amount to just small, sub-dominant contributions. This view seemed to be endorsed by the seminal results obtained over the last decades in the context of renormalization of quantum fields in curved spa... |
2111.03277 | Banibrata Mukhopadhyay | Banibrata Mukhopadhyay, Tanuman Ghosh, Soumya Kanti Ganguly | Gravitational geometric phase | 10 pages; based on the talk given in the 16th Marcel Grossmann
Meeting (MG16) held online during July 5-10, 2021; to appear in the
proceeding of MG16 | null | null | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that spinors propagating in curved gravitational background acquire
an interaction with spacetime curvature, which leads to a quantum mechanical
geometric effect. This is similar to what happens in the case of magnetic
fields, known as Pancharatnam-Berry phase. As the magnetic and gravitational
fields have ce... | [
{
"created": "Fri, 5 Nov 2021 05:44:09 GMT",
"version": "v1"
}
] | 2021-11-09 | [
[
"Mukhopadhyay",
"Banibrata",
""
],
[
"Ghosh",
"Tanuman",
""
],
[
"Ganguly",
"Soumya Kanti",
""
]
] | We show that spinors propagating in curved gravitational background acquire an interaction with spacetime curvature, which leads to a quantum mechanical geometric effect. This is similar to what happens in the case of magnetic fields, known as Pancharatnam-Berry phase. As the magnetic and gravitational fields have cert... |
gr-qc/0603012 | Jannie Leach | Jannie A Leach, Sante Carloni and Peter K S Dunsby | Shear dynamics in Bianchi I cosmologies with R^n-gravity | 25 pages LaTeX, 6 figures. Revised to match the final version
accepted for publication in CQG | Class.Quant.Grav.23:4915-4937,2006 | 10.1088/0264-9381/23/15/011 | null | gr-qc astro-ph hep-th | null | We give the equations governing the shear evolution in Bianchi spacetimes for
general f(R)-theories of gravity. We consider the case of R^n-gravity and
perform a detailed analysis of the dynamics in Bianchi I cosmologies which
exhibit local rotational symmetry. We find exact solutions and study their
behaviour and st... | [
{
"created": "Mon, 6 Mar 2006 16:22:50 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Jun 2006 09:58:26 GMT",
"version": "v2"
}
] | 2010-11-05 | [
[
"Leach",
"Jannie A",
""
],
[
"Carloni",
"Sante",
""
],
[
"Dunsby",
"Peter K S",
""
]
] | We give the equations governing the shear evolution in Bianchi spacetimes for general f(R)-theories of gravity. We consider the case of R^n-gravity and perform a detailed analysis of the dynamics in Bianchi I cosmologies which exhibit local rotational symmetry. We find exact solutions and study their behaviour and stab... |
gr-qc/0611143 | Katanaev | G. de Berredo-Peixoto, M. O. Katanaev | Inside the BTZ black hole | 24 pages, 8 figures | Phys.Rev.D75:024004,2007 | 10.1103/PhysRevD.75.024004 | null | gr-qc | null | We consider static circularly symmetric solution of three-dimensional
Einstein's equations with negative cosmological constant (the BTZ black hole).
The case of zero cosmological constant corresponding to the interior region of
a black hole is analyzed in detail. We prove that the maximally extended BTZ
solution with... | [
{
"created": "Mon, 27 Nov 2006 19:31:30 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"de Berredo-Peixoto",
"G.",
""
],
[
"Katanaev",
"M. O.",
""
]
] | We consider static circularly symmetric solution of three-dimensional Einstein's equations with negative cosmological constant (the BTZ black hole). The case of zero cosmological constant corresponding to the interior region of a black hole is analyzed in detail. We prove that the maximally extended BTZ solution with z... |
2105.00066 | Dong-han Yeom | Dong-han Yeom | Speculation about the black hole final state: resolving singularity by
quantum gravity | 4 pages, 1 figure; Proceedings of Beyond Standard Model: From Theory
to Experiment. Talk on March 29, 2021, Giza, Egypt | null | 10.31526/ACP.BSM-2021.37 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | The interior of the black hole can be described by anisotropic cosmology. By
quantizing the metric function, we can obtain the Wheeler-DeWitt equation for
inside the horizon. In order to interpret the wave function consistently, one
needs to impose a boundary condition. In this paper, we introduce a
prescription for ... | [
{
"created": "Fri, 30 Apr 2021 20:02:04 GMT",
"version": "v1"
}
] | 2022-09-08 | [
[
"Yeom",
"Dong-han",
""
]
] | The interior of the black hole can be described by anisotropic cosmology. By quantizing the metric function, we can obtain the Wheeler-DeWitt equation for inside the horizon. In order to interpret the wave function consistently, one needs to impose a boundary condition. In this paper, we introduce a prescription for th... |
0709.0732 | David Wiltshire | David L. Wiltshire | Exact solution to the averaging problem in cosmology | 4 pages; v2 references added, to appear in Phys. Rev. Letters | Phys.Rev.Lett.99:251101,2007 | 10.1103/PhysRevLett.99.251101 | null | gr-qc astro-ph hep-ph hep-th | null | The exact solution of a two-scale Buchert average of the Einstein equations
is derived for an inhomogeneous universe which represents a close approximation
to the observed universe. The two scales represent voids, and the bubble walls
surrounding them within which clusters of galaxies are located. As described
elsewh... | [
{
"created": "Thu, 6 Sep 2007 11:57:39 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Nov 2007 05:28:14 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Wiltshire",
"David L.",
""
]
] | The exact solution of a two-scale Buchert average of the Einstein equations is derived for an inhomogeneous universe which represents a close approximation to the observed universe. The two scales represent voids, and the bubble walls surrounding them within which clusters of galaxies are located. As described elsewher... |
1406.7587 | Kent Yagi | Kent Yagi, Leo C. Stein, George Pappas, Nicolas Yunes, Theocharis A.
Apostolatos | Why I-Love-Q | 23 pages, 22 figures; matches version appearing in PRD | Phys. Rev. D 90, 063010 (2014) | 10.1103/PhysRevD.90.063010 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Black holes are said to have no hair because all of their multipole moments
can be expressed in terms of just their mass, charge and spin angular momentum.
The recent discovery of approximately equation-of-state-independent relations
among certain multipole moments in neutron stars suggests that they are also
approxi... | [
{
"created": "Mon, 30 Jun 2014 02:54:43 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Sep 2014 17:49:24 GMT",
"version": "v2"
}
] | 2014-09-25 | [
[
"Yagi",
"Kent",
""
],
[
"Stein",
"Leo C.",
""
],
[
"Pappas",
"George",
""
],
[
"Yunes",
"Nicolas",
""
],
[
"Apostolatos",
"Theocharis A.",
""
]
] | Black holes are said to have no hair because all of their multipole moments can be expressed in terms of just their mass, charge and spin angular momentum. The recent discovery of approximately equation-of-state-independent relations among certain multipole moments in neutron stars suggests that they are also approxima... |
1809.09125 | Vijay Varma | Vijay Varma, Davide Gerosa, Leo C. Stein, Fran\c{c}ois H\'ebert, and
Hao Zhang | High-accuracy mass, spin, and recoil predictions of generic black-hole
merger remnants | 6+5 pages. Matches PRL version. Python implementation available at
https://pypi.org/project/surfinBH/ | Phys. Rev. Lett. 122, 011101 (2019) | 10.1103/PhysRevLett.122.011101 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present accurate fits for the remnant properties of generically precessing
binary black holes, trained on large banks of numerical-relativity simulations.
We use Gaussian process regression to interpolate the remnant mass, spin, and
recoil velocity in the 7-dimensional parameter space of precessing black-hole
bina... | [
{
"created": "Mon, 24 Sep 2018 18:00:21 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Jan 2019 17:04:06 GMT",
"version": "v2"
}
] | 2019-01-16 | [
[
"Varma",
"Vijay",
""
],
[
"Gerosa",
"Davide",
""
],
[
"Stein",
"Leo C.",
""
],
[
"Hébert",
"François",
""
],
[
"Zhang",
"Hao",
""
]
] | We present accurate fits for the remnant properties of generically precessing binary black holes, trained on large banks of numerical-relativity simulations. We use Gaussian process regression to interpolate the remnant mass, spin, and recoil velocity in the 7-dimensional parameter space of precessing black-hole binari... |
0801.2919 | Yuri Bonder | Y. Bonder | A Lorentz Invariant Phenomenological Model of Quantum Gravity | 7 pages. Talk presented at "From Quantum to Emergent Gravity: Theory
and Phenomenology," June 2007, Trieste, Italy | null | null | null | gr-qc | null | We consider a model of Quantum Gravity phenomenology, based on the idea that
space-time may have some unknown granular structure that respects the Lorentz
symmetry. The proposal involves non-trivial couplings of curvature to matter
fields and leads to a well defined phenomenology. In this manuscript, a brief
descript... | [
{
"created": "Fri, 18 Jan 2008 16:04:15 GMT",
"version": "v1"
}
] | 2008-01-21 | [
[
"Bonder",
"Y.",
""
]
] | We consider a model of Quantum Gravity phenomenology, based on the idea that space-time may have some unknown granular structure that respects the Lorentz symmetry. The proposal involves non-trivial couplings of curvature to matter fields and leads to a well defined phenomenology. In this manuscript, a brief descriptio... |
2003.07431 | Israel Quiros | Israel Quiros, Tame Gonzalez, Roberto De Arcia, Ricardo
Garc\'ia-Salcedo, Ulises Nucamendi, Joel F. Saavedra | Inflationary equilibrium configurations of scalar-tensor theories of
gravity | 30 pages, 6 figures (12 eps files). Comments acknowledged. Version
accepted in PRD | Phys. Rev. D 101, 103518 (2020) | 10.1103/PhysRevD.101.103518 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we investigate the asymptotic dynamics of inflationary
cosmological models that are based in scalar-tensor theories of gravity. Our
main aim is to explore the global structure of the phase space in the framework
of single-field inflation models. For this purpose we make emphasis in the
adequate choice o... | [
{
"created": "Mon, 16 Mar 2020 20:28:31 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Apr 2020 18:42:11 GMT",
"version": "v2"
}
] | 2020-05-20 | [
[
"Quiros",
"Israel",
""
],
[
"Gonzalez",
"Tame",
""
],
[
"De Arcia",
"Roberto",
""
],
[
"García-Salcedo",
"Ricardo",
""
],
[
"Nucamendi",
"Ulises",
""
],
[
"Saavedra",
"Joel F.",
""
]
] | In this paper we investigate the asymptotic dynamics of inflationary cosmological models that are based in scalar-tensor theories of gravity. Our main aim is to explore the global structure of the phase space in the framework of single-field inflation models. For this purpose we make emphasis in the adequate choice of ... |
1504.02068 | Mehdi Assanioussi | Emanuele Alesci, Mehdi Assanioussi, Jerzy Lewandowski, Ilkka M\"akinen | Hamiltonian operator for loop quantum gravity coupled to a scalar field | Minor corrections implemented | Phys. Rev. D 91, 124067 (2015) | 10.1103/PhysRevD.91.124067 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the construction of a physical Hamiltonian operator in the
deparametrized model of loop quantum gravity coupled to a free scalar field.
This construction is based on the use of the recently introduced curvature
operator, and on the idea of so-called "special loops". We discuss in detail
the regularization ... | [
{
"created": "Wed, 8 Apr 2015 18:28:28 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Jun 2015 15:08:35 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Alesci",
"Emanuele",
""
],
[
"Assanioussi",
"Mehdi",
""
],
[
"Lewandowski",
"Jerzy",
""
],
[
"Mäkinen",
"Ilkka",
""
]
] | We present the construction of a physical Hamiltonian operator in the deparametrized model of loop quantum gravity coupled to a free scalar field. This construction is based on the use of the recently introduced curvature operator, and on the idea of so-called "special loops". We discuss in detail the regularization pr... |
1906.03131 | Luciano Petruzziello | Luca Buoninfante, Giuseppe Gaetano Luciano, Luciano Petruzziello and
Luca Smaldone | Neutrino oscillations in extended theories of gravity | null | Phys. Rev. D 101, 024016 (2020) | 10.1103/PhysRevD.101.024016 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study neutrino oscillations within the framework of extended theories of
gravity. Based on the covariant reformulation of Pontecorvo formalism, we
evaluate the oscillation probability of neutrinos propagating in static
spacetimes described by gravitational actions quadratic in the curvature
invariants. Calculation... | [
{
"created": "Fri, 7 Jun 2019 14:34:58 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Jan 2020 10:41:39 GMT",
"version": "v2"
}
] | 2020-01-22 | [
[
"Buoninfante",
"Luca",
""
],
[
"Luciano",
"Giuseppe Gaetano",
""
],
[
"Petruzziello",
"Luciano",
""
],
[
"Smaldone",
"Luca",
""
]
] | We study neutrino oscillations within the framework of extended theories of gravity. Based on the covariant reformulation of Pontecorvo formalism, we evaluate the oscillation probability of neutrinos propagating in static spacetimes described by gravitational actions quadratic in the curvature invariants. Calculations ... |
1201.1655 | Carlos Kozameh | Melina Bordcoch, Carlos Kozameh, Alejandra Rojas | NSF 2.0: A spin weight zero formulation of General Relativity | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a set of three PDEs for three real scalars that are equivalent to
the full Einstein equations without any symmetry assumptions. The main
variables in this formulation are null surfaces and a conformal factor.
Furthermore, for asymptotically flat spacetimes the free data (representing
gravitational radiat... | [
{
"created": "Sun, 8 Jan 2012 20:15:47 GMT",
"version": "v1"
},
{
"created": "Sat, 14 Jan 2012 15:26:21 GMT",
"version": "v2"
}
] | 2012-01-17 | [
[
"Bordcoch",
"Melina",
""
],
[
"Kozameh",
"Carlos",
""
],
[
"Rojas",
"Alejandra",
""
]
] | We present a set of three PDEs for three real scalars that are equivalent to the full Einstein equations without any symmetry assumptions. The main variables in this formulation are null surfaces and a conformal factor. Furthermore, for asymptotically flat spacetimes the free data (representing gravitational radiation)... |
gr-qc/0407070 | Wojciech P. Tarkowski | Wojciech P. Tarkowski | Searching for a solution to the cosmological constant problem - a toy
model | 53 pages, 2 figures; published in 2001, a number of sentences added | Class.Quant.Grav.18:2359-2391,2001 | 10.1088/0264-9381/18/12/310 | null | gr-qc astro-ph hep-th quant-ph | null | This paper concerns the so-called cosmological constant problem. In order to
solve it, we propose a toy model providing an extension of the dimensionality
of spacetime, with an additional spatial dimension which is macroscopically
unobservable. The toy model introduces no corrections to most predictions of
the "stand... | [
{
"created": "Mon, 19 Jul 2004 02:56:18 GMT",
"version": "v1"
},
{
"created": "Sat, 2 Oct 2004 19:55:31 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Tarkowski",
"Wojciech P.",
""
]
] | This paper concerns the so-called cosmological constant problem. In order to solve it, we propose a toy model providing an extension of the dimensionality of spacetime, with an additional spatial dimension which is macroscopically unobservable. The toy model introduces no corrections to most predictions of the "standar... |
gr-qc/9602059 | null | M. Rainer | Classifying spaces for homogeneous manifolds and their related Lie
isometry deformations | Latex, 22 pages, 3 figures available as hardcopy | null | null | IPM-95-CCMP | gr-qc | null | Among plenty of applications, low-dimensional homogeneous spaces appear in
cosmological models as both, classical factor spaces of multidimensional
geometry and minisuperspaces in canonical quantization.
Here a new tool to restrict their continuous deformations is presented:
Classifying spaces for homogeneous manif... | [
{
"created": "Wed, 28 Feb 1996 14:52:54 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Rainer",
"M.",
""
]
] | Among plenty of applications, low-dimensional homogeneous spaces appear in cosmological models as both, classical factor spaces of multidimensional geometry and minisuperspaces in canonical quantization. Here a new tool to restrict their continuous deformations is presented: Classifying spaces for homogeneous manifolds... |
2004.04527 | Nelson Christensen | Jean-Yves Vinet, Nelson Christensen, Nicoleta Dinu-Jaeger, Michel
Lintz, Nary Man, Mikha\"el Pichot | Numerical solutions for phase noise due to pointing jitter with the LISA
telescope | null | J. Phys. Commun. 4 045005 (2020) | 10.1088/2399-6528/ab852e | null | gr-qc astro-ph.IM physics.optics | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The aim of the Laser Interferometer Space Antenna (LISA) is to detect
gravitational waves through a phase modulation in long (2.5 Mkm) laser light
links between spacecraft. Among other noise sources to be addressed are the
phase fluctuations caused by a possible angular jitter of the emitted beam. The
present paper f... | [
{
"created": "Thu, 9 Apr 2020 13:15:26 GMT",
"version": "v1"
}
] | 2020-06-14 | [
[
"Vinet",
"Jean-Yves",
""
],
[
"Christensen",
"Nelson",
""
],
[
"Dinu-Jaeger",
"Nicoleta",
""
],
[
"Lintz",
"Michel",
""
],
[
"Man",
"Nary",
""
],
[
"Pichot",
"Mikhaël",
""
]
] | The aim of the Laser Interferometer Space Antenna (LISA) is to detect gravitational waves through a phase modulation in long (2.5 Mkm) laser light links between spacecraft. Among other noise sources to be addressed are the phase fluctuations caused by a possible angular jitter of the emitted beam. The present paper fol... |
2103.01140 | Axel Brandenburg | Axel Brandenburg, Grigol Gogoberidze, Tina Kahniashvili, Sayan Mandal,
Alberto Roper Pol, Nakul Shenoy | The scalar, vector, and tensor modes in gravitational wave turbulence
simulations | 25 pages, 8 figures | Class. Quantum Grav. 38, 145002 (2021) | 10.1088/1361-6382/ac011c | NORDITA-2021-019 | gr-qc astro-ph.CO physics.flu-dyn | http://creativecommons.org/licenses/by/4.0/ | We study the gravitational wave (GW) signal sourced by primordial turbulence
that is assumed to be present at cosmological phase transitions like the
electroweak and quantum chromodynamics phase transitions. We consider various
models of primordial turbulence, such as those with and without helicity,
purely hydrodyna... | [
{
"created": "Mon, 1 Mar 2021 17:21:33 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Jun 2021 03:34:32 GMT",
"version": "v2"
}
] | 2021-06-28 | [
[
"Brandenburg",
"Axel",
""
],
[
"Gogoberidze",
"Grigol",
""
],
[
"Kahniashvili",
"Tina",
""
],
[
"Mandal",
"Sayan",
""
],
[
"Pol",
"Alberto Roper",
""
],
[
"Shenoy",
"Nakul",
""
]
] | We study the gravitational wave (GW) signal sourced by primordial turbulence that is assumed to be present at cosmological phase transitions like the electroweak and quantum chromodynamics phase transitions. We consider various models of primordial turbulence, such as those with and without helicity, purely hydrodynami... |
0808.0169 | Muhammad Akbar | M. Akbar | Viscous Cosmology and Thermodynamics of Apparent Horizon | 8 pages | Chin.Phys.Lett.25:4199-4202,2008 | 10.1088/0256-307X/25/12/004 | null | gr-qc | http://creativecommons.org/licenses/by/3.0/ | It is shown that the differential form of Friedmann equations of FRW universe
can be recast as a similar form of the first law, $T_{h}dS_{h} = dE + WdV$, of
thermodynamics at the apparent horizon of FRW universe filled with the viscous
fluid. It is also shown that the generalized second law of thermodynamics holds
at... | [
{
"created": "Fri, 1 Aug 2008 18:35:17 GMT",
"version": "v1"
}
] | 2008-12-25 | [
[
"Akbar",
"M.",
""
]
] | It is shown that the differential form of Friedmann equations of FRW universe can be recast as a similar form of the first law, $T_{h}dS_{h} = dE + WdV$, of thermodynamics at the apparent horizon of FRW universe filled with the viscous fluid. It is also shown that the generalized second law of thermodynamics holds at t... |
0809.1817 | Sergey Siparov | Sergey Siparov | Anisotropic geometrodynamics in cosmological problems | v3: numerical modelling added | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The gravitation theory is modified on the base of geometric identity and
equivalence principle. This makes it possible to generalize the geodesics and
solve several problems of classical GRT such as flat rotation curves of the
spiral galaxies, Tully-Fisher law and some others and reveal the fundamental
(geometrical) ... | [
{
"created": "Wed, 10 Sep 2008 15:26:30 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Oct 2008 09:23:18 GMT",
"version": "v2"
},
{
"created": "Sun, 2 Aug 2009 19:55:26 GMT",
"version": "v3"
}
] | 2009-08-02 | [
[
"Siparov",
"Sergey",
""
]
] | The gravitation theory is modified on the base of geometric identity and equivalence principle. This makes it possible to generalize the geodesics and solve several problems of classical GRT such as flat rotation curves of the spiral galaxies, Tully-Fisher law and some others and reveal the fundamental (geometrical) or... |
2305.17413 | J. W. van Holten | J.W. van Holten | Dynamics of cosmological scalar fields | 14 pages, 6 figures | null | null | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by-nc-nd/4.0/ | This paper reviews the dynamics of an isotropic and homogeneous cosmological
scalar field. A general approach to the solution of the Einstein-Klein-Gordon
equations is developed, which does not require slow-roll or other
approximations. General conclusions about the qualitative behaviour of the
solutions can be drawn... | [
{
"created": "Sat, 27 May 2023 08:35:50 GMT",
"version": "v1"
}
] | 2023-05-30 | [
[
"van Holten",
"J. W.",
""
]
] | This paper reviews the dynamics of an isotropic and homogeneous cosmological scalar field. A general approach to the solution of the Einstein-Klein-Gordon equations is developed, which does not require slow-roll or other approximations. General conclusions about the qualitative behaviour of the solutions can be drawn, ... |
gr-qc/0304038 | Janna Levin | John D. Barrow and Janna Levin (DAMTP) | The Copernican Principle in Compact Spacetimes | 5 pages | Mon.Not.Roy.Astron.Soc.346:615,2003 | 10.1046/j.1365-2966.2003.07117.x | null | gr-qc astro-ph | null | Copernicus realised we were not at the centre of the universe. A universe
made finite by topological identifications introduces a new Copernican
consideration: while we may not be at the geometric centre of the universe,
some galaxy could be. A finite universe also picks out a preferred frame: the
frame in which the ... | [
{
"created": "Wed, 9 Apr 2003 11:00:11 GMT",
"version": "v1"
}
] | 2011-05-23 | [
[
"Barrow",
"John D.",
"",
"DAMTP"
],
[
"Levin",
"Janna",
"",
"DAMTP"
]
] | Copernicus realised we were not at the centre of the universe. A universe made finite by topological identifications introduces a new Copernican consideration: while we may not be at the geometric centre of the universe, some galaxy could be. A finite universe also picks out a preferred frame: the frame in which the un... |
1208.1385 | S. Mignemi | S. Mignemi | Black brane solutions of Einstein-Maxwell-scalar theory with Liouville
potential | 17 pages, plain TeX, 1 figure; some errors have been corrected and
the discussion of the results modified accordingly | null | 10.1142/S0217751X13500802 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the global properties of black brane solutions of a
three-parameter Einstein-Maxwell model nonminimally coupled to a scalar with
exponential potential. The black brane solutions of this model have recently
been investigated because of their relevance for holography and for the
AdS/condensed matter corr... | [
{
"created": "Tue, 7 Aug 2012 10:01:12 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Apr 2013 08:31:58 GMT",
"version": "v2"
}
] | 2015-06-11 | [
[
"Mignemi",
"S.",
""
]
] | We investigate the global properties of black brane solutions of a three-parameter Einstein-Maxwell model nonminimally coupled to a scalar with exponential potential. The black brane solutions of this model have recently been investigated because of their relevance for holography and for the AdS/condensed matter corres... |
gr-qc/9505004 | Andrew Chamblin | L. J. Alty and A. Chamblin | Obstructions to Pin Structures on Kleinian Manifolds | 20 pages, Latex, 2 xfigures available from Andrew Chamblin at
H.A.Chamblin@damtp.cam.ac.uk | J.Math.Phys. 37 (1996) 2001-2012 | 10.1063/1.531491 | DAMTP preprint # R94/58 | gr-qc | null | We develop various topological notions on four-manifolds of Kleinian
signature $(- - + +)$. In particular, we extend the concept of `Kleinian metric
homotopy' to non-orientable manifolds. We then derive the topological
obstructions to pin-Klein cobordism, for all of the pin groups. Finally, we
discuss various example... | [
{
"created": "Wed, 3 May 1995 17:23:55 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Alty",
"L. J.",
""
],
[
"Chamblin",
"A.",
""
]
] | We develop various topological notions on four-manifolds of Kleinian signature $(- - + +)$. In particular, we extend the concept of `Kleinian metric homotopy' to non-orientable manifolds. We then derive the topological obstructions to pin-Klein cobordism, for all of the pin groups. Finally, we discuss various examples ... |
gr-qc/0405014 | Michal Demetrian | Michal Demetrian | False vacuum decay via Coleman - de Luccia instanton in the theory with
quasi-exponential potential | 2 pages, 1 figure | null | null | null | gr-qc | null | The necessary and sufficient condition for the false vacuum decay in a de
Sitter universe via Coleman - de Luccia instanton is applied on the scalar
field with quasi - exponential potential.
| [
{
"created": "Mon, 3 May 2004 16:10:45 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Demetrian",
"Michal",
""
]
] | The necessary and sufficient condition for the false vacuum decay in a de Sitter universe via Coleman - de Luccia instanton is applied on the scalar field with quasi - exponential potential. |
1306.2375 | Jong Hyuk Yoon | Jong Hyuk Yoon | Problem of time and Hamiltonian reduction in the (2+2) formalism | 4 pages, 1 figure in pdf | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We apply the Hamiltonian reduction procedure to general spacetimes of
4-dimensions in the (2+2) formalism and find privileged spacetime coordinates
in which the physical Hamiltonian is expressed in true degrees of freedom only,
namely, the conformal two-metric on the cross section of null hypersurfaces and
its conjug... | [
{
"created": "Mon, 10 Jun 2013 22:40:03 GMT",
"version": "v1"
}
] | 2013-06-12 | [
[
"Yoon",
"Jong Hyuk",
""
]
] | We apply the Hamiltonian reduction procedure to general spacetimes of 4-dimensions in the (2+2) formalism and find privileged spacetime coordinates in which the physical Hamiltonian is expressed in true degrees of freedom only, namely, the conformal two-metric on the cross section of null hypersurfaces and its conjugat... |
1707.00723 | Jakub Bilski | Jakub Bilski and Antonino Marciano | 2+1 homogeneous Loop Quantum Gravity with a scalar field clock | 15 pages, typos corrected, cross-citation added | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We focus on three-dimensional QRLG with the purpose of shedding light on the
link between reduced LQG and LQC in four space-time dimensions. Considering
homogeneous three-dimensional LQG, the theory simplifies to QRLG. We then
implement Thiemann's Quantum Spin Dynamics for Euclidean three-dimensional
space-time in pr... | [
{
"created": "Mon, 3 Jul 2017 18:34:37 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Jul 2017 10:46:56 GMT",
"version": "v2"
}
] | 2017-07-06 | [
[
"Bilski",
"Jakub",
""
],
[
"Marciano",
"Antonino",
""
]
] | We focus on three-dimensional QRLG with the purpose of shedding light on the link between reduced LQG and LQC in four space-time dimensions. Considering homogeneous three-dimensional LQG, the theory simplifies to QRLG. We then implement Thiemann's Quantum Spin Dynamics for Euclidean three-dimensional space-time in pres... |
2008.12761 | James Lucietti | James Lucietti, Fred Tomlinson | Moduli space of stationary vacuum black holes from integrability | 58 pages. v2: typos fixed, minor clarifications, to appear in Adv.
Theor. Math. Phys | Adv. Theor. Math. Phys. Volume 26, Number 2, 371-454, 2022 | 10.4310/ATMP.2022.v26.n2.a4 | EMPG-20-16 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the classification of asymptotically flat, stationary, vacuum
black hole spacetimes in four and five dimensions, that admit one and two
commuting axial Killing fields respectively. It is well known that the Einstein
equations reduce to a harmonic map on the two-dimensional orbit space, which
itself arises... | [
{
"created": "Fri, 28 Aug 2020 17:36:48 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Jun 2021 14:41:29 GMT",
"version": "v2"
}
] | 2023-01-05 | [
[
"Lucietti",
"James",
""
],
[
"Tomlinson",
"Fred",
""
]
] | We consider the classification of asymptotically flat, stationary, vacuum black hole spacetimes in four and five dimensions, that admit one and two commuting axial Killing fields respectively. It is well known that the Einstein equations reduce to a harmonic map on the two-dimensional orbit space, which itself arises a... |
1502.01386 | Fumika Suzuki | Fumika Suzuki and Friedemann Queisser | Environmental gravitational decoherence and a tensor noise model | 8 pages, 2 figures, based on a talk presented by FS at DICE 2014,
Castiglioncello, Italy, 15th-19th September 2014 | null | 10.1088/1742-6596/626/1/012039 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss decrease of coherence in a massive system due to the emission of
gravitational waves. In particular we investigate environmental gravitational
decoherence in the context of an interference experiment. The time-evolution of
the reduced density matrix is solved analytically using the path-integral
formalism.... | [
{
"created": "Wed, 4 Feb 2015 22:46:13 GMT",
"version": "v1"
}
] | 2015-07-09 | [
[
"Suzuki",
"Fumika",
""
],
[
"Queisser",
"Friedemann",
""
]
] | We discuss decrease of coherence in a massive system due to the emission of gravitational waves. In particular we investigate environmental gravitational decoherence in the context of an interference experiment. The time-evolution of the reduced density matrix is solved analytically using the path-integral formalism. F... |
2204.10512 | Zhao Li | Zhao Li, Jin Qiao, Wen Zhao, Xinzhong Er | Gravitational Faraday rotation of gravitational waves by a Kerr black
hole | 13 pages, 1 figure, accepted by JCAP | null | 10.1088/1475-7516/2022/10/095 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Gravitational Faraday Rotation (GFR) is a frame-dragging effect induced by
rotating massive objects, which is one of the important, yet studied
characteristics of lensed gravitational waves (GWs). In this work, we calculate
the GFR angle $\chi_g$ of GWs in the weak deflection limit, assuming it is
lensed by a Kerr bl... | [
{
"created": "Fri, 22 Apr 2022 05:40:51 GMT",
"version": "v1"
},
{
"created": "Sun, 23 Oct 2022 13:08:18 GMT",
"version": "v2"
}
] | 2022-11-09 | [
[
"Li",
"Zhao",
""
],
[
"Qiao",
"Jin",
""
],
[
"Zhao",
"Wen",
""
],
[
"Er",
"Xinzhong",
""
]
] | Gravitational Faraday Rotation (GFR) is a frame-dragging effect induced by rotating massive objects, which is one of the important, yet studied characteristics of lensed gravitational waves (GWs). In this work, we calculate the GFR angle $\chi_g$ of GWs in the weak deflection limit, assuming it is lensed by a Kerr blac... |
gr-qc/0411022 | Marco Bruni | Marco Bruni, Andrea Nerozzi, Frances White | Newman-Penrose quantities as valuable tools in astrophysical relativity | 3 pages. Proceedings of 16th SIGRAV conference, Vietri, Italy,
September 2004 | null | 10.1063/1.1891553 | null | gr-qc astro-ph | null | In this talk I will briefly outline work in progress in two different
contexts in astrophysical relativity, i.e. the study of rotating star
spacetimes and the problem of reliably extracting gravitational wave templates
in numerical relativity. In both cases the use of Weyl scalars and curvature
invariants helps to cl... | [
{
"created": "Wed, 3 Nov 2004 23:32:15 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Bruni",
"Marco",
""
],
[
"Nerozzi",
"Andrea",
""
],
[
"White",
"Frances",
""
]
] | In this talk I will briefly outline work in progress in two different contexts in astrophysical relativity, i.e. the study of rotating star spacetimes and the problem of reliably extracting gravitational wave templates in numerical relativity. In both cases the use of Weyl scalars and curvature invariants helps to clar... |
2001.04651 | Fabio D'Ambrosio | Fabio D'Ambrosio | Semi-Classical Holomorphic Transition Amplitudes in Covariant Loop
Quantum Gravity | Ph.D. thesis submitted for the degree of Doctor in Theoretical and
Mathematical Physics. Defended at the Center for Theoretical Physics of
Aix-Marseille University, the 23rd of September 2019. The manuscript is
written in English and begins with a short summary in French | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Covariant Loop Quantum Gravity (CLQG) is a tentative background-independent
and non-perturbative theory of quantum gravity which has emerged from a number
of different research directions. Recently, this theory has been applied to the
so-called Planck star model -- a particular model of stellar collapse in which
non-... | [
{
"created": "Tue, 14 Jan 2020 07:47:30 GMT",
"version": "v1"
}
] | 2020-01-15 | [
[
"D'Ambrosio",
"Fabio",
""
]
] | Covariant Loop Quantum Gravity (CLQG) is a tentative background-independent and non-perturbative theory of quantum gravity which has emerged from a number of different research directions. Recently, this theory has been applied to the so-called Planck star model -- a particular model of stellar collapse in which non-pe... |
2307.07285 | Tom\'a\v{s} M\'alek | Ivan Kol\'a\v{r}, Tom\'a\v{s} M\'alek | Infinite derivative gravity resolves nonscalar curvature singularities | 5 pages, 1 figure | Phys. Rev. D 108, L081502 (2023) | 10.1103/PhysRevD.108.L081502 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We explicitly demonstrate that the nonlocal ghost-free ultraviolet
modification of general relativity (GR) known as the infinite derivative
gravity (IDG) resolves nonscalar curvature singularities in exact solutions of
the full theory. We analyze exact pp-wave solutions of GR and IDG describing
gravitational waves ge... | [
{
"created": "Fri, 14 Jul 2023 11:35:25 GMT",
"version": "v1"
}
] | 2023-11-13 | [
[
"Kolář",
"Ivan",
""
],
[
"Málek",
"Tomáš",
""
]
] | We explicitly demonstrate that the nonlocal ghost-free ultraviolet modification of general relativity (GR) known as the infinite derivative gravity (IDG) resolves nonscalar curvature singularities in exact solutions of the full theory. We analyze exact pp-wave solutions of GR and IDG describing gravitational waves gene... |
2407.14693 | Francisco Cleiton Estev\~ao Lima | F. C. E. Lima, F. M. Belchior, C. A. S. Almeida and P. K. Sahoo | On the asymmetric non-canonical braneworld in five dimensions | 16 pages, 7 captioned figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Revisiting Einstein's gravitational theory, we build a five-dimensional
braneworld. Within this framework, one announces the appearance of symmetric
and asymmetric domain walls. Furthermore, it examines the emergent
four-dimensional gravity from a theory with non-canonical dynamics. Exploring
the physical and mathema... | [
{
"created": "Fri, 19 Jul 2024 22:53:30 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Jul 2024 18:14:31 GMT",
"version": "v2"
},
{
"created": "Wed, 7 Aug 2024 22:07:28 GMT",
"version": "v3"
}
] | 2024-08-09 | [
[
"Lima",
"F. C. E.",
""
],
[
"Belchior",
"F. M.",
""
],
[
"Almeida",
"C. A. S.",
""
],
[
"Sahoo",
"P. K.",
""
]
] | Revisiting Einstein's gravitational theory, we build a five-dimensional braneworld. Within this framework, one announces the appearance of symmetric and asymmetric domain walls. Furthermore, it examines the emergent four-dimensional gravity from a theory with non-canonical dynamics. Exploring the physical and mathemati... |
gr-qc/9502038 | David Wiltshire | D.L. Wiltshire | Dilaton black holes with a cosmological term | 20 pages, phyzzx, v2 contains expanded introduction, additional
references etc to coincide with published version | J.Austral.Math.Soc.B41:198-216,1999 | null | ADP-94-29/M26 | gr-qc | null | The properties of static spherically symmetric black holes, which carry
electric and magnetic charges, and which are coupled to the dilaton in the
presence of a cosmological term (Liouville-type potential, or cosmological
constant) are reviewed.
| [
{
"created": "Thu, 23 Feb 1995 08:43:19 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Oct 1999 09:17:31 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Wiltshire",
"D. L.",
""
]
] | The properties of static spherically symmetric black holes, which carry electric and magnetic charges, and which are coupled to the dilaton in the presence of a cosmological term (Liouville-type potential, or cosmological constant) are reviewed. |
2307.04144 | Yu Zhang | Qian Li, Chen Ma, Yu Zhang, Zhi-Wen Lin, Peng-Fei Duan | Shadow, absorption and Hawking radiation of a Schwarzschild black hole
surrounded by a cloud of strings in Rastall gravity | 27 pages, 10 figures, 1 Table | Eur. Phys. J. C 82, 658 (2022) | 10.1140/epjc/s10052-022-10623-3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper studies the black hole shadow, absorption cross section, and
Hawking radiation of a massless scalar field in the background of a static
spherically symmetric black hole spacetime that is surrounded by a cloud of
strings in Rastall gravity. Specifically, the effects of the parameters $a$ and
$\beta$ on the ... | [
{
"created": "Sun, 9 Jul 2023 10:17:07 GMT",
"version": "v1"
}
] | 2023-07-11 | [
[
"Li",
"Qian",
""
],
[
"Ma",
"Chen",
""
],
[
"Zhang",
"Yu",
""
],
[
"Lin",
"Zhi-Wen",
""
],
[
"Duan",
"Peng-Fei",
""
]
] | This paper studies the black hole shadow, absorption cross section, and Hawking radiation of a massless scalar field in the background of a static spherically symmetric black hole spacetime that is surrounded by a cloud of strings in Rastall gravity. Specifically, the effects of the parameters $a$ and $\beta$ on the ph... |
1911.06483 | Liam O'Brien | Liam O'Brien and Lorenzo Sorbo | Instantons for particles joined by strings in three dimensional gravity | 13 pages, 4 figures | Class. Quantum Grav. 36 245008 (2019) | 10.1088/1361-6382/ab4a3e | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the instantons describing the production of particles at the ends of
codimension-one objects (strings and struts) in $(2+1)$-dimensional Minkowski
and de Sitter spaces. A Minkowskian background allows only for systems with
vanishing total mass, so that either negative mass particles or negative
tension strut... | [
{
"created": "Fri, 15 Nov 2019 06:02:43 GMT",
"version": "v1"
}
] | 2019-11-18 | [
[
"O'Brien",
"Liam",
""
],
[
"Sorbo",
"Lorenzo",
""
]
] | We study the instantons describing the production of particles at the ends of codimension-one objects (strings and struts) in $(2+1)$-dimensional Minkowski and de Sitter spaces. A Minkowskian background allows only for systems with vanishing total mass, so that either negative mass particles or negative tension struts ... |
1505.00228 | Zoltan Keresztes | Zsolt Horv\'ath, Zolt\'an Keresztes, Alexander Yu. Kamenshchik,
L\'aszl\'o \'A. Gergely | Criticality and Big Brake singularities in the tachyonic evolutions of
closed Friedmann universes with cold dark matter | 7 pages, 5 figures, to be published in Phys. Rev. D | Phys. Rev. D 91, 103513 (2015) | 10.1103/PhysRevD.91.103513 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The evolution of a closed Friedmann universe filled by a tachyon scalar field
with a trigonometric potential and cold dark matter (CDM) is investigated. A
subset of the evolutions consistent to 1$\sigma $ confidence level with the
Union 2.1 supernova data set is identified. The evolutions of the tachyon field
are cla... | [
{
"created": "Fri, 1 May 2015 17:32:44 GMT",
"version": "v1"
}
] | 2015-05-21 | [
[
"Horváth",
"Zsolt",
""
],
[
"Keresztes",
"Zoltán",
""
],
[
"Kamenshchik",
"Alexander Yu.",
""
],
[
"Gergely",
"László Á.",
""
]
] | The evolution of a closed Friedmann universe filled by a tachyon scalar field with a trigonometric potential and cold dark matter (CDM) is investigated. A subset of the evolutions consistent to 1$\sigma $ confidence level with the Union 2.1 supernova data set is identified. The evolutions of the tachyon field are class... |
1301.5481 | Hermann Nicolai | Hermann Nicolai | Quantum Gravity: the view from particle physics | Invited Lecture at the conference "Relativity and Gravitation: 100
Years after Einstein in Prague", June 25 - 29, 2012, Prague, Czech Republic | null | 10.1007/978-3-319-06349-2_18 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This lecture reviews aspects of and prospects for progress towards a theory
of quantum gravity from a particle physics perspective, also paying attention
to recent findings of the LHC experiments at CERN.
| [
{
"created": "Wed, 23 Jan 2013 12:11:33 GMT",
"version": "v1"
}
] | 2015-06-12 | [
[
"Nicolai",
"Hermann",
""
]
] | This lecture reviews aspects of and prospects for progress towards a theory of quantum gravity from a particle physics perspective, also paying attention to recent findings of the LHC experiments at CERN. |
2302.10695 | I. V. Kanatchikov | I.V. Kanatchikov | Towards Precanonical Quantum Teleparallel Gravity | 17 pages | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quantization of the teleparallel equivalent of general relativity (TEGR) is
discussed from the perspective of the space-time symmetric De Donder-Weyl (DW)
Hamiltonian formulation with constraints and its quantization called
precanonical quantization. The representations of operators and the covariant
Schr\"odinger eq... | [
{
"created": "Tue, 21 Feb 2023 14:26:03 GMT",
"version": "v1"
}
] | 2023-02-22 | [
[
"Kanatchikov",
"I. V.",
""
]
] | Quantization of the teleparallel equivalent of general relativity (TEGR) is discussed from the perspective of the space-time symmetric De Donder-Weyl (DW) Hamiltonian formulation with constraints and its quantization called precanonical quantization. The representations of operators and the covariant Schr\"odinger equa... |
2306.11101 | Mariaveronica De Angelis | Giovanni Montani, Mariaveronica De Angelis, Flavio Bombacigno, Nakia
Carlevaro | Metric $f(R)$ gravity with dynamical dark energy as a scenario for the
Hubble tension | 6 pages, 4 figures | Mon.Not.Roy.Astron.Soc. Letters 527 (2024) 1, L156-L161 | 10.1093/mnrasl/slad159 | null | gr-qc astro-ph.CO | http://creativecommons.org/publicdomain/zero/1.0/ | We introduce a theoretical framework to interpret the Hubble tension, based
on the combination of a metric $f(R)$ gravity with a dynamical dark energy
contribution. The modified gravity provides the non-minimally coupled scalar
field responsible for the proper scaling of the Hubble constant, in order to
accommodate f... | [
{
"created": "Mon, 19 Jun 2023 18:08:06 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Nov 2023 09:52:49 GMT",
"version": "v2"
}
] | 2023-11-07 | [
[
"Montani",
"Giovanni",
""
],
[
"De Angelis",
"Mariaveronica",
""
],
[
"Bombacigno",
"Flavio",
""
],
[
"Carlevaro",
"Nakia",
""
]
] | We introduce a theoretical framework to interpret the Hubble tension, based on the combination of a metric $f(R)$ gravity with a dynamical dark energy contribution. The modified gravity provides the non-minimally coupled scalar field responsible for the proper scaling of the Hubble constant, in order to accommodate for... |
gr-qc/0207114 | Gavriel Segre | Gavriel Segre | Einstein's lifts and topologies: topological investigations on the
Principle of Equivalence | null | null | null | null | gr-qc | null | The gedanken-experiment of Einstein's lift is analyzed in order of
determining whether the free-falling observer inside the lift can detect the
eventual topological non-triviality of space-time
| [
{
"created": "Sun, 28 Jul 2002 16:56:36 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Segre",
"Gavriel",
""
]
] | The gedanken-experiment of Einstein's lift is analyzed in order of determining whether the free-falling observer inside the lift can detect the eventual topological non-triviality of space-time |
1405.0519 | Francisco Lobo | Tiberiu Harko, Francisco S. N. Lobo, G. Otalora, Emmanuel N. Saridakis | $f(T,\mathcal{T})$ gravity and cosmology | 31 pages, 15 figures; matches published version | JCAP 12 (2014) 021 | 10.1088/1475-7516/2014/12/021 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an extension of $f(T)$ gravity, allowing for a general coupling of
the torsion scalar $T$ with the trace of the matter energy-momentum tensor
$\mathcal{T}$. The resulting $f(T,\mathcal{T})$ theory is a new modified
gravity, since it is different from all the existing torsion or curvature based
construction... | [
{
"created": "Fri, 2 May 2014 21:37:45 GMT",
"version": "v1"
},
{
"created": "Wed, 7 May 2014 11:37:12 GMT",
"version": "v2"
},
{
"created": "Thu, 11 Dec 2014 18:50:50 GMT",
"version": "v3"
}
] | 2014-12-12 | [
[
"Harko",
"Tiberiu",
""
],
[
"Lobo",
"Francisco S. N.",
""
],
[
"Otalora",
"G.",
""
],
[
"Saridakis",
"Emmanuel N.",
""
]
] | We present an extension of $f(T)$ gravity, allowing for a general coupling of the torsion scalar $T$ with the trace of the matter energy-momentum tensor $\mathcal{T}$. The resulting $f(T,\mathcal{T})$ theory is a new modified gravity, since it is different from all the existing torsion or curvature based constructions.... |
1201.2948 | Jose' P. S. Lemos | Alexander B. Balakin, Vladimir V. Bochkarev, Jos\'e P. S. Lemos | Light propagation with non-minimal couplings in a two-component cosmic
dark fluid with an Archimedean-type force and unlighted cosmological epochs | 23 pages, 8 figures | Phys.Rev.D85:064015,2012 | 10.1103/PhysRevD.85.064015 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | During the evolution of the universe there are at least two epochs during
which electromagnetic waves cannot scan the universe's internal structure
neither bring information to outside observers. The first epoch is when photons
are in local thermodynamic equilibrium with other particles, and the second is
when photon... | [
{
"created": "Fri, 13 Jan 2012 21:02:20 GMT",
"version": "v1"
}
] | 2012-11-08 | [
[
"Balakin",
"Alexander B.",
""
],
[
"Bochkarev",
"Vladimir V.",
""
],
[
"Lemos",
"José P. S.",
""
]
] | During the evolution of the universe there are at least two epochs during which electromagnetic waves cannot scan the universe's internal structure neither bring information to outside observers. The first epoch is when photons are in local thermodynamic equilibrium with other particles, and the second is when photon s... |
2209.00868 | Zheng-Wen Long | Meng-Yao Zhang, Hao Chen, Hassan Hassanabadi, Zheng-Wen Long, and Hui
Yang | Joule-Thomson expansion of charged dilatonic black holes | null | Chinese Physics C (2022) | 10.1088/1674-1137/aca958 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Based on the Einstein-Maxwell theory, the Joule-Thomson (J-T) expansion of
charged dilatonic black holes (the solutions are neither flat nor AdS) in
$(n+1)$-dimensional spacetime is studied herein. To this end, we analyze the
effects of the dimension $n$ and dilaton field $\alpha$ on J-T expansion. An
explicit expres... | [
{
"created": "Fri, 2 Sep 2022 07:59:15 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Sep 2022 02:58:49 GMT",
"version": "v2"
},
{
"created": "Tue, 6 Dec 2022 08:11:50 GMT",
"version": "v3"
},
{
"created": "Thu, 16 Feb 2023 07:21:14 GMT",
"version": "v4"
}
] | 2023-02-17 | [
[
"Zhang",
"Meng-Yao",
""
],
[
"Chen",
"Hao",
""
],
[
"Hassanabadi",
"Hassan",
""
],
[
"Long",
"Zheng-Wen",
""
],
[
"Yang",
"Hui",
""
]
] | Based on the Einstein-Maxwell theory, the Joule-Thomson (J-T) expansion of charged dilatonic black holes (the solutions are neither flat nor AdS) in $(n+1)$-dimensional spacetime is studied herein. To this end, we analyze the effects of the dimension $n$ and dilaton field $\alpha$ on J-T expansion. An explicit expressi... |
2206.03814 | Lorenzo Sebastiani | Lorenzo Sebastiani and Sergio Zerbini | Some remarks on non-singular spherically symmetric space-times | 25 pages, final version accepted in Astronomy | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | A short review on spherically symmetric static regular black holes and
spherically symmetric non singular cosmological space-time is presented.
Several models of regular black holes, including new ones, are considered.
First, a large class of regular black holes having an inner de Sitter core with
the related issue o... | [
{
"created": "Wed, 8 Jun 2022 11:25:17 GMT",
"version": "v1"
},
{
"created": "Sat, 15 Oct 2022 07:11:48 GMT",
"version": "v2"
},
{
"created": "Wed, 23 Nov 2022 14:33:42 GMT",
"version": "v3"
}
] | 2022-11-24 | [
[
"Sebastiani",
"Lorenzo",
""
],
[
"Zerbini",
"Sergio",
""
]
] | A short review on spherically symmetric static regular black holes and spherically symmetric non singular cosmological space-time is presented. Several models of regular black holes, including new ones, are considered. First, a large class of regular black holes having an inner de Sitter core with the related issue of ... |
2105.09174 | Cosimo Bambi | Bakhtiyor Narzilloev, Daniele Malafarina, Ahmadjon Abdujabbarov,
Bobomurat Ahmedo, Cosimo Bambi | Particle motion around a static axially symmetric wormhole | 12 pages, 9 figures; v2: refereed version | Phys. Rev. D 104, 064016 (2021) | 10.1103/PhysRevD.104.064016 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the properties of a static axially symmetric wormhole described
by an exact solution of Einstein's field equations and investigate how we can
distinguish such a hypothetical object from a black hole. To this aim, we
explore the motion of test particles and photons in the wormhole's space-time
and compare ... | [
{
"created": "Wed, 19 May 2021 14:45:24 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Sep 2021 20:39:43 GMT",
"version": "v2"
}
] | 2021-09-09 | [
[
"Narzilloev",
"Bakhtiyor",
""
],
[
"Malafarina",
"Daniele",
""
],
[
"Abdujabbarov",
"Ahmadjon",
""
],
[
"Ahmedo",
"Bobomurat",
""
],
[
"Bambi",
"Cosimo",
""
]
] | We consider the properties of a static axially symmetric wormhole described by an exact solution of Einstein's field equations and investigate how we can distinguish such a hypothetical object from a black hole. To this aim, we explore the motion of test particles and photons in the wormhole's space-time and compare it... |
2010.05755 | Francisco Lobo | Khadije Jafarzade, Mahdi Kord Zangeneh, Francisco S. N. Lobo | Shadow, deflection angle and quasinormal modes of Born-Infeld charged
black holes | 10 pages, 4 figures- V2: Analysis improved with the consistent
Aoki-Gorji-Mukohyama theory of 4D EGB gravity with BI nonlinear
electrodynamics. Discussion and references added; abstract improved. Accepted
for publication in JCAP. arXiv admin note: text overlap with arXiv:2009.12988 | JCAP 04 (2021) 008 | 10.1088/1475-7516/2021/04/008 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we consider black holes in the consistent Aoki-Gorji-Mukohyama
theory of the four-dimensional Einstein-Gauss-Bonnet (4D EGB) gravity in the
presence of Born-Infeld (BI) nonlinear electrodynamics. We study several
optical features of these black holes such as the shadow radius, energy
emission rate and ... | [
{
"created": "Thu, 8 Oct 2020 09:48:51 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Feb 2021 16:14:23 GMT",
"version": "v2"
}
] | 2021-04-07 | [
[
"Jafarzade",
"Khadije",
""
],
[
"Zangeneh",
"Mahdi Kord",
""
],
[
"Lobo",
"Francisco S. N.",
""
]
] | In this paper, we consider black holes in the consistent Aoki-Gorji-Mukohyama theory of the four-dimensional Einstein-Gauss-Bonnet (4D EGB) gravity in the presence of Born-Infeld (BI) nonlinear electrodynamics. We study several optical features of these black holes such as the shadow radius, energy emission rate and de... |
1907.10301 | Alexander Ganz | Alexander Ganz, Nicola Bartolo, Sabino Matarrese | Towards a viable effective field theory of mimetic gravity | null | null | 10.1088/1475-7516/2019/12/037 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss mimetic gravity theories with direct couplings between the
curvature and higher derivatives of the scalar field, up to the quintic order,
which were proposed to solve the instability problem for linear perturbations
around the FLRW background for this kind of models. Restricting to homogeneous
scalar field... | [
{
"created": "Wed, 24 Jul 2019 08:48:34 GMT",
"version": "v1"
}
] | 2019-12-18 | [
[
"Ganz",
"Alexander",
""
],
[
"Bartolo",
"Nicola",
""
],
[
"Matarrese",
"Sabino",
""
]
] | We discuss mimetic gravity theories with direct couplings between the curvature and higher derivatives of the scalar field, up to the quintic order, which were proposed to solve the instability problem for linear perturbations around the FLRW background for this kind of models. Restricting to homogeneous scalar field c... |
2203.14039 | Chen Songbai | Jiayi Liu, Songbai Chen, Jiliang Jing | Tidal effects of dark matter halo around a galactic black hole | 14 pages, 6 figures, Accepted by Chin. Phys. C | Chin. Phys. C 46, 105104 (2022) | 10.1088/1674-1137/ac7856 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have investigated the tidal forces and geodesic deviation motion in the
spacetime of a black hole in the galaxy with dark matter halo. Our results show
that the tidal force and geodesic deviation motion depend on the dark matter
halo mass and the typical lengthscale of galaxy. The effect of the typical
lengthscale... | [
{
"created": "Sat, 26 Mar 2022 10:07:41 GMT",
"version": "v1"
},
{
"created": "Sat, 4 Jun 2022 09:56:06 GMT",
"version": "v2"
}
] | 2022-09-07 | [
[
"Liu",
"Jiayi",
""
],
[
"Chen",
"Songbai",
""
],
[
"Jing",
"Jiliang",
""
]
] | We have investigated the tidal forces and geodesic deviation motion in the spacetime of a black hole in the galaxy with dark matter halo. Our results show that the tidal force and geodesic deviation motion depend on the dark matter halo mass and the typical lengthscale of galaxy. The effect of the typical lengthscale o... |
0709.0442 | Miquel Nofrarias | M. Nofrarias, A. F. Garcia Marin, A. Lobo, G. Heinzel, J.
Ramos-Castro, J. Sanjuan and K. Danzmann | Thermal diagnostic of the Optical Window on board LISA Pathfinder | 20 pages, 14 figures; accepted for publication in Class. Quantum Grav | Class.Quant.Grav.24:5103-5122,2007 | 10.1088/0264-9381/24/20/012 | null | gr-qc | null | Vacuum conditions inside the LTP Gravitational Reference Sensor must comply
with rather demanding requirements. The Optical Window (OW) is an interface
which seals the vacuum enclosure and, at the same time, lets the laser beam go
through for interferometric Metrology with the test masses. The OW is a
plane-parallel ... | [
{
"created": "Tue, 4 Sep 2007 14:30:39 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Nofrarias",
"M.",
""
],
[
"Marin",
"A. F. Garcia",
""
],
[
"Lobo",
"A.",
""
],
[
"Heinzel",
"G.",
""
],
[
"Ramos-Castro",
"J.",
""
],
[
"Sanjuan",
"J.",
""
],
[
"Danzmann",
"K.",
""
]
] | Vacuum conditions inside the LTP Gravitational Reference Sensor must comply with rather demanding requirements. The Optical Window (OW) is an interface which seals the vacuum enclosure and, at the same time, lets the laser beam go through for interferometric Metrology with the test masses. The OW is a plane-parallel pl... |
gr-qc/0011043 | Kenichi Sasaki | M. Hotta, K. Sasaki, T. Sasaki | Diffeomorphism on Horizon as an Asymptotic Isometry of Schwarzschild
Black Hole | 18 pages, no figures, corrected some typos | Class.Quant.Grav. 18 (2001) 1823-1834 | 10.1088/0264-9381/18/10/301 | TU-606 | gr-qc hep-th | null | It is argued that the diffeomorphism on the horizontal sphere can be regarded
as a nontrivial asymptotic isometry of the Schwarzschild black hole. We propose
a new boundary condition of asymptotic metrics near the horizon and show that
the condition admits the local time-shift and diffeomorphism on the horizon as
the... | [
{
"created": "Mon, 13 Nov 2000 06:25:59 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Nov 2000 01:57:01 GMT",
"version": "v2"
},
{
"created": "Thu, 15 Mar 2001 03:42:56 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Hotta",
"M.",
""
],
[
"Sasaki",
"K.",
""
],
[
"Sasaki",
"T.",
""
]
] | It is argued that the diffeomorphism on the horizontal sphere can be regarded as a nontrivial asymptotic isometry of the Schwarzschild black hole. We propose a new boundary condition of asymptotic metrics near the horizon and show that the condition admits the local time-shift and diffeomorphism on the horizon as the a... |
2203.03763 | Phillipo Lappicy | Kevin E. M. Church, Olivier H\'enot, Phillipo Lappicy, Jean-Philippe
Lessard and Hauke Sprink | Periodic orbits in Ho\v{r}ava-Lifshitz cosmologies | 21 pages, 7 figures. arXiv admin note: text overlap with
arXiv:2012.07614 | null | 10.1007/s10714-022-03054-8 | null | gr-qc math-ph math.CA math.DS math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider spatially homogeneous Ho\v{r}ava-Lifshitz (HL) models that
perturb General Relativity (GR) by a parameter $v\in (0,1)$ such that GR occurs
at $v=1/2$. We describe the dynamics for the extremal case $v=0$, which possess
the usual Bianchi hierarchy: type $\mathrm{I}$ (Kasner circle of equilibria),
type $\ma... | [
{
"created": "Mon, 7 Mar 2022 22:57:49 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Dec 2022 21:19:10 GMT",
"version": "v2"
}
] | 2022-12-28 | [
[
"Church",
"Kevin E. M.",
""
],
[
"Hénot",
"Olivier",
""
],
[
"Lappicy",
"Phillipo",
""
],
[
"Lessard",
"Jean-Philippe",
""
],
[
"Sprink",
"Hauke",
""
]
] | We consider spatially homogeneous Ho\v{r}ava-Lifshitz (HL) models that perturb General Relativity (GR) by a parameter $v\in (0,1)$ such that GR occurs at $v=1/2$. We describe the dynamics for the extremal case $v=0$, which possess the usual Bianchi hierarchy: type $\mathrm{I}$ (Kasner circle of equilibria), type $\math... |
gr-qc/9412052 | Hartmut Frommert | H. Dehnen and E. Hitzer | SU(2) $\times$ U(1) Gauge Gravity | 24 pages, latex, no figures | Int.J.Theor.Phys.34:1981-2001,1995 | 10.1007/BF00674079 | null | gr-qc hep-th | null | We propose a Lorentz-covariant Yang-Mills ``spin-gauge'' theory, where the
function valued Pauli matrices play the role of a non-scalar Higgs-field. As
symmetry group we choose $SU(2) \times U(1)$ of the 2-spinors describing
particle/antiparticle states. After symmetry breaking a non-scalar
Lorentz-covariant Higgs-fi... | [
{
"created": "Tue, 20 Dec 1994 10:42:19 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Dehnen",
"H.",
""
],
[
"Hitzer",
"E.",
""
]
] | We propose a Lorentz-covariant Yang-Mills ``spin-gauge'' theory, where the function valued Pauli matrices play the role of a non-scalar Higgs-field. As symmetry group we choose $SU(2) \times U(1)$ of the 2-spinors describing particle/antiparticle states. After symmetry breaking a non-scalar Lorentz-covariant Higgs-fiel... |
1106.2287 | Ritabrata Biswas | Ritabrata Biswas, Nairwita Mazumder and Subenoy Chakraborty | Evolution of the horizons for dark energy universe | 11 pages | null | 10.1007/s10773-012-1239-y | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent observational evidences of accelerating phase of the universe strongly
demand that the dominating matter in the universe is in the form of dark
energy. In this work, we study the evolution of the apparent and event horizons
for various dark energy models and examine their behavior across phantom
barrier line.
| [
{
"created": "Sun, 12 Jun 2011 08:11:21 GMT",
"version": "v1"
}
] | 2015-05-28 | [
[
"Biswas",
"Ritabrata",
""
],
[
"Mazumder",
"Nairwita",
""
],
[
"Chakraborty",
"Subenoy",
""
]
] | Recent observational evidences of accelerating phase of the universe strongly demand that the dominating matter in the universe is in the form of dark energy. In this work, we study the evolution of the apparent and event horizons for various dark energy models and examine their behavior across phantom barrier line. |
1311.6872 | Dong-han Yeom | Dong-il Hwang, Dong-han Yeom | Toward inflation models compatible with the no-boundary proposal | 34 pages, 14 figures | JCAP 1406(2014)007 | 10.1088/1475-7516/2014/06/007 | YITP-13-122 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we investigate various inflation models in the context of the
no-boundary proposal. We propose that a good inflation model should satisfy
three conditions: observational constraints, plausible initial conditions, and
naturalness of the model. For various inflation models, we assign the
probability to e... | [
{
"created": "Wed, 27 Nov 2013 05:38:02 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Jun 2014 01:53:17 GMT",
"version": "v2"
}
] | 2014-06-09 | [
[
"Hwang",
"Dong-il",
""
],
[
"Yeom",
"Dong-han",
""
]
] | In this paper, we investigate various inflation models in the context of the no-boundary proposal. We propose that a good inflation model should satisfy three conditions: observational constraints, plausible initial conditions, and naturalness of the model. For various inflation models, we assign the probability to eac... |
2108.06294 | Alexander Vikman | C\'edric Deffayet, Shinji Mukohyama, Alexander Vikman | Ghosts without runaway | 4 pages + refs, 4 figures | null | null | YITP-21-82, IPMU21-0052 | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | We present a simple class of mechanical models where a canonical degree of
freedom interacts with another one with a negative kinetic term, i.e. with a
ghost. We prove analytically that the classical motion of the system is
completely stable for all initial conditions, notwithstanding that the
conserved Hamiltonian i... | [
{
"created": "Fri, 13 Aug 2021 15:57:49 GMT",
"version": "v1"
}
] | 2021-08-16 | [
[
"Deffayet",
"Cédric",
""
],
[
"Mukohyama",
"Shinji",
""
],
[
"Vikman",
"Alexander",
""
]
] | We present a simple class of mechanical models where a canonical degree of freedom interacts with another one with a negative kinetic term, i.e. with a ghost. We prove analytically that the classical motion of the system is completely stable for all initial conditions, notwithstanding that the conserved Hamiltonian is ... |
2111.00283 | Torben Frost | Torben C. Frost | Gravitational Lensing by Charged Accelerating Black Holes | Submitted Conference Proceedings for 16th Marcel Grossmann Meeting,
fixed typos/formulations | null | 10.1142/9789811269776_0323 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Current astrophysical observations show that on large scale the Universe is
electrically neutral. However, locally this may be quite different. Black holes
enveloped by a plasma in the presence of a strong magnetic field may have
acquired a significant electric charge. We can also expect that some of these
charged bl... | [
{
"created": "Sat, 30 Oct 2021 16:28:12 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Nov 2021 17:04:59 GMT",
"version": "v2"
}
] | 2023-04-04 | [
[
"Frost",
"Torben C.",
""
]
] | Current astrophysical observations show that on large scale the Universe is electrically neutral. However, locally this may be quite different. Black holes enveloped by a plasma in the presence of a strong magnetic field may have acquired a significant electric charge. We can also expect that some of these charged blac... |
2404.04192 | Edward Wilson-Ewing | Lorenzo Cipriani, Francesco Fazzini, Edward Wilson-Ewing | Gravitational collapse in effective loop quantum gravity: beyond
marginally bound configurations | 36 pages, 9 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study gravitational collapse in effective loop quantum gravity, focusing
on non-marginally bound configurations in Lema\^itre-Tolman-Bondi spacetimes.
In the homogeneous limit we recover the effective dynamics of loop quantum
cosmology for Friedman cosmologies with spatial curvature. We study a
particular family o... | [
{
"created": "Fri, 5 Apr 2024 16:04:23 GMT",
"version": "v1"
}
] | 2024-04-08 | [
[
"Cipriani",
"Lorenzo",
""
],
[
"Fazzini",
"Francesco",
""
],
[
"Wilson-Ewing",
"Edward",
""
]
] | We study gravitational collapse in effective loop quantum gravity, focusing on non-marginally bound configurations in Lema\^itre-Tolman-Bondi spacetimes. In the homogeneous limit we recover the effective dynamics of loop quantum cosmology for Friedman cosmologies with spatial curvature. We study a particular family of ... |
gr-qc/0409050 | Richard O'Shaughenssy | R. O'Shaughnessy, S. Strigin, S. Vyatchanin | The implications of Mexican-hat mirrors: calculations of thermoelastic
noise and interferometer sensitivity to perturbation for the
Mexican-hat-mirror proposal for advanced LIGO | Submitted to PRD. This paper is a close companion to a related paper,
"Reducing thermoelastic noise in gravitational interferometers by flattening
the light beams", by D'Ambrosio et al | null | null | null | gr-qc | null | Thermoelastic noise will be the most significant noise source in
advanced-LIGO interferometers with sapphire test masses. The standard plan for
advanced-LIGO has optimized the optics, within the framework of conventional
mirrors, to reduce thermoelastic noise. Recently, we and our collaborators have
proposed going be... | [
{
"created": "Mon, 13 Sep 2004 01:43:07 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"O'Shaughnessy",
"R.",
""
],
[
"Strigin",
"S.",
""
],
[
"Vyatchanin",
"S.",
""
]
] | Thermoelastic noise will be the most significant noise source in advanced-LIGO interferometers with sapphire test masses. The standard plan for advanced-LIGO has optimized the optics, within the framework of conventional mirrors, to reduce thermoelastic noise. Recently, we and our collaborators have proposed going beyo... |
1906.05957 | Valerio Faraoni | Valerio Faraoni, Jeremy C\^ot\'e, Andrea Giusti | Do Solar System experiments constrain scalar-tensor gravity? | Explanation added, bibliography expanded. Matches the version
accepted in Eur. Phys. J. C | null | 10.1140/epjc/s10052-020-7721-4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is now established that, contrary to common belief, (electro-)vacuum
Brans-Dicke gravity does not reduce to general relativity for large values of
the Brans-Dicke coupling $\omega$. Since the essence of experimental tests of
scalar-tensor gravity consists of providing stringent lower bounds on $\omega$,
the PPN fo... | [
{
"created": "Thu, 13 Jun 2019 22:50:34 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Feb 2020 19:23:47 GMT",
"version": "v2"
}
] | 2020-03-18 | [
[
"Faraoni",
"Valerio",
""
],
[
"Côté",
"Jeremy",
""
],
[
"Giusti",
"Andrea",
""
]
] | It is now established that, contrary to common belief, (electro-)vacuum Brans-Dicke gravity does not reduce to general relativity for large values of the Brans-Dicke coupling $\omega$. Since the essence of experimental tests of scalar-tensor gravity consists of providing stringent lower bounds on $\omega$, the PPN form... |
gr-qc/9404024 | Genadi A. Sardanashvily | G.Sardanashvily (Department of Theoretical Physics, Moscow State
University, Moscow, Russia) | Gravitation Singularities of the Caustic Type | LaTeX Preprint MSU-TP-94-31 | null | null | null | gr-qc | null | In view of the well-known correspondence between gravitational fields and
space-time distributions on a world manifold X, the criterion of gravitation
singularities as singularities of these distributions is suggested. In the germ
terms, singularities of a (3+1) distribution look locally like singularities of
a folia... | [
{
"created": "Wed, 13 Apr 1994 10:02:20 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Sardanashvily",
"G.",
"",
"Department of Theoretical Physics, Moscow State\n University, Moscow, Russia"
]
] | In view of the well-known correspondence between gravitational fields and space-time distributions on a world manifold X, the criterion of gravitation singularities as singularities of these distributions is suggested. In the germ terms, singularities of a (3+1) distribution look locally like singularities of a foliati... |
0812.1645 | Gerhard Rein | Hakan Andreasson, Markus Kunze, Gerhard Rein | Gravitational collapse and the formation of black holes for the
spherically symmetric Einstein-Vlasov system | 35 pages | Q.Appl.Math.68:17-42,2010 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review results on the spherically symmetric, asymptotically flat
Einstein-Vlasov system. We focus on a recent result where we found explicit
conditions on the initial data which guarantee the formation of a black hole in
the evolution. Among these data there are data such that the corresponding
solutions exist glo... | [
{
"created": "Tue, 9 Dec 2008 10:09:54 GMT",
"version": "v1"
}
] | 2011-02-24 | [
[
"Andreasson",
"Hakan",
""
],
[
"Kunze",
"Markus",
""
],
[
"Rein",
"Gerhard",
""
]
] | We review results on the spherically symmetric, asymptotically flat Einstein-Vlasov system. We focus on a recent result where we found explicit conditions on the initial data which guarantee the formation of a black hole in the evolution. Among these data there are data such that the corresponding solutions exist globa... |
1403.5910 | Daniele Faccio | N. Westerberg, S. Cacciatori, F. Belgiorno, F. Dalla Piazza and D.
Faccio | Experimental quantum cosmology in time-dependent optical media | Version accepted fro publication in New Journal of Physics | null | 10.1088/1367-2630/16/7/075003 | null | gr-qc physics.optics quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is possible to construct artificial spacetime geometries for light by
using intense laser pulses that modify the spatiotemporal properties of an
optical medium. Here we theoretically investigate experimental possibilities
for studying spacetime metrics of the form
$\textrm{d}s^2=c^2\textrm{d}t^2-\eta(t)^2\textrm{d... | [
{
"created": "Mon, 24 Mar 2014 10:58:22 GMT",
"version": "v1"
},
{
"created": "Wed, 14 May 2014 14:47:56 GMT",
"version": "v2"
}
] | 2015-06-19 | [
[
"Westerberg",
"N.",
""
],
[
"Cacciatori",
"S.",
""
],
[
"Belgiorno",
"F.",
""
],
[
"Piazza",
"F. Dalla",
""
],
[
"Faccio",
"D.",
""
]
] | It is possible to construct artificial spacetime geometries for light by using intense laser pulses that modify the spatiotemporal properties of an optical medium. Here we theoretically investigate experimental possibilities for studying spacetime metrics of the form $\textrm{d}s^2=c^2\textrm{d}t^2-\eta(t)^2\textrm{d}x... |
gr-qc/0401091 | Lorenzo Iorio | Lorenzo Iorio | On the Possibility of Measuring the Lense--Thirring Effect with a
Lageos-Lageos II-Optis Mission | LaTex2e, 3 pages, 1 Table, no figures. Paper presented at X Marcel
Grossmann Meeting, Rio de Janeiro, 20-26 July 2003 | null | 10.1142/9789812704030_0272 | null | gr-qc astro-ph physics.space-ph | null | The possibility of performing post-Newtonian gravitoelectromagnetic
measurements with a joint LAGEOS-LAGEOS II-OPTIS space-based mission is
investigated
| [
{
"created": "Wed, 21 Jan 2004 20:54:07 GMT",
"version": "v1"
}
] | 2016-11-09 | [
[
"Iorio",
"Lorenzo",
""
]
] | The possibility of performing post-Newtonian gravitoelectromagnetic measurements with a joint LAGEOS-LAGEOS II-OPTIS space-based mission is investigated |
2008.04816 | Dishant Pandya M | B. Thakore, R. Goti, S. Shah, H. Pandya and D. M. Pandya | Finch-Skea Solutions of Anisotropic Stellar Models in $f(R)$ Gravity | 24 Pages, 19 Figures and 5 Tables | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Present paper deals with the composition and modelling of compact dense
astrophysical bodies under the framework of $f(R)$ gravity. The model is
employed on various observed strange stars viz., SMC X-1, SAX J1808.4-3658,
Swift J1818.0-1607, PSR J1614-2230 and PSR J0348+0432. Upon setting the
appropriate value of dime... | [
{
"created": "Sun, 9 Aug 2020 17:41:25 GMT",
"version": "v1"
}
] | 2020-08-12 | [
[
"Thakore",
"B.",
""
],
[
"Goti",
"R.",
""
],
[
"Shah",
"S.",
""
],
[
"Pandya",
"H.",
""
],
[
"Pandya",
"D. M.",
""
]
] | Present paper deals with the composition and modelling of compact dense astrophysical bodies under the framework of $f(R)$ gravity. The model is employed on various observed strange stars viz., SMC X-1, SAX J1808.4-3658, Swift J1818.0-1607, PSR J1614-2230 and PSR J0348+0432. Upon setting the appropriate value of dimens... |
2309.11468 | Pradip Kumar Chattopadhyay Dr. | B. Das, K. B. Goswami and P. K. Chattopadhyay | A comparative study on maximum mass and radius of compact star from
Heintzmann geometry and TOV approach | 27 pages, 21 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by-nc-nd/4.0/ | In this article a class of anisotropic compact star is analysed in Heintzmann
geometry. We have introduced the pressure anisotropy parameter ($\alpha$) and
solved Einstein field equations to obtain stellar model. We have considered
$g_{tt}$ component as proposed by Heintzmann and by solving Einstein field
equation, t... | [
{
"created": "Wed, 20 Sep 2023 17:08:37 GMT",
"version": "v1"
}
] | 2023-09-21 | [
[
"Das",
"B.",
""
],
[
"Goswami",
"K. B.",
""
],
[
"Chattopadhyay",
"P. K.",
""
]
] | In this article a class of anisotropic compact star is analysed in Heintzmann geometry. We have introduced the pressure anisotropy parameter ($\alpha$) and solved Einstein field equations to obtain stellar model. We have considered $g_{tt}$ component as proposed by Heintzmann and by solving Einstein field equation, the... |
1011.4223 | Maria Babiuc | M.C. Babiuc, B. Szilagyi, J. Winicour, Y. Zlochower | A Characteristic Extraction Tool for Gravitational Waveforms | 30 pages, 15 figures, submitted to Physical Review D | Phys.Rev.D84:044057,2011 | 10.1103/PhysRevD.84.044057 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop and calibrate a characteristic waveform extraction tool whose
major improvements and corrections of prior versions allow satisfaction of the
accuracy standards required for advanced LIGO data analysis. The extraction
tool uses a characteristic evolution code to propagate numerical data on an
inner worldtub... | [
{
"created": "Thu, 18 Nov 2010 16:29:55 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Jun 2011 21:37:26 GMT",
"version": "v2"
},
{
"created": "Mon, 8 Aug 2011 14:54:58 GMT",
"version": "v3"
}
] | 2011-09-26 | [
[
"Babiuc",
"M. C.",
""
],
[
"Szilagyi",
"B.",
""
],
[
"Winicour",
"J.",
""
],
[
"Zlochower",
"Y.",
""
]
] | We develop and calibrate a characteristic waveform extraction tool whose major improvements and corrections of prior versions allow satisfaction of the accuracy standards required for advanced LIGO data analysis. The extraction tool uses a characteristic evolution code to propagate numerical data on an inner worldtube ... |
gr-qc/0309097 | Stephane Fay | Stephane Fay | A reciprocal Wald theorem for varying gravitational function | 13 pages | Eur.Phys.J.C30d01:008,2003; Eur.Phys.J.C32S1:107-118,2004 | 10.1140/epjcd/s2003-01-008-2 | null | gr-qc | null | We study when a cosmological constant is a natural issue if it is mimicked by
the potential of a massive Hyperextended Scalar Tensor theory with a perfect
fluid for Bianchi type I and V models. We then deduce a reciprocal Wald theorem
giving the conditions such that the potential tends to a non vanishing constant
whe... | [
{
"created": "Fri, 19 Sep 2003 13:00:47 GMT",
"version": "v1"
}
] | 2009-12-17 | [
[
"Fay",
"Stephane",
""
]
] | We study when a cosmological constant is a natural issue if it is mimicked by the potential of a massive Hyperextended Scalar Tensor theory with a perfect fluid for Bianchi type I and V models. We then deduce a reciprocal Wald theorem giving the conditions such that the potential tends to a non vanishing constant when ... |
2309.08367 | Paul Tod | Paul Tod | Conformal Methods in Mathematical Cosmology | 14 pages, to appear in Phil.Trans.A; based on a talk at the Royal
Society Discussion Meeting "At the interface of asymptotics, conformal
methods and analysis in general relativity", London, 9th-10th May 2023 | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | When he first introduced the notion of a conformal boundary into the study of
asymptotically empty space-times, Penrose noted that that the boundary would be
null, space-like or time-like according as the cosmological constant $\Lambda$
was zero, positive or negative. While most applications of the idea of a
conforma... | [
{
"created": "Fri, 15 Sep 2023 12:48:23 GMT",
"version": "v1"
}
] | 2023-09-18 | [
[
"Tod",
"Paul",
""
]
] | When he first introduced the notion of a conformal boundary into the study of asymptotically empty space-times, Penrose noted that that the boundary would be null, space-like or time-like according as the cosmological constant $\Lambda$ was zero, positive or negative. While most applications of the idea of a conformal ... |
2312.05260 | Carlos Alex Souza Da Silva Dr | Carlos Silva | A note on the AdS/CFT correspondence and the nature of spacetime in
quantum gravity | Published in: Nucl.Phys.B 998 (2024) 116402. Possible text overlap
with arxiv 2205.09502 [gr-qc] by the same author | Nucl.Phys.B 998 (2024) 116402 | 10.1016/j.nuclphysb.2023.116402 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we address the nature of spacetime in quantum gravity in light
of a new version of the holographic principle that has established a
relationship between string theory and polymer holonomy structures similar to
Loop Quantum Cosmology spin networks. In front of the results found out, it is
possible to ar... | [
{
"created": "Fri, 1 Dec 2023 20:13:12 GMT",
"version": "v1"
}
] | 2023-12-12 | [
[
"Silva",
"Carlos",
""
]
] | In this paper, we address the nature of spacetime in quantum gravity in light of a new version of the holographic principle that has established a relationship between string theory and polymer holonomy structures similar to Loop Quantum Cosmology spin networks. In front of the results found out, it is possible to argu... |
0709.0407 | Bahtiyar Ozgur Sarioglu | Ozgur Sarioglu, Bayram Tekin | Another proof of the positive energy theorem in gravity | v2: 7 pages, no figures, REVTeX4; Major revision including the change
in the title, the focus is now only on the D=4 case | null | null | null | gr-qc hep-th | null | We show that gravitational energy expression simplifies when a new set of
coordinates that satisfies a certain asymptotic gauge condition is used.
Compared to the ADM formula, positivity of the energy is more transparent in
this new construction. Our proof relies on the asymptotic symmetries
(specifically supertransl... | [
{
"created": "Tue, 4 Sep 2007 12:24:33 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Feb 2008 12:38:30 GMT",
"version": "v2"
}
] | 2008-02-14 | [
[
"Sarioglu",
"Ozgur",
""
],
[
"Tekin",
"Bayram",
""
]
] | We show that gravitational energy expression simplifies when a new set of coordinates that satisfies a certain asymptotic gauge condition is used. Compared to the ADM formula, positivity of the energy is more transparent in this new construction. Our proof relies on the asymptotic symmetries (specifically supertranslat... |
gr-qc/9806123 | Don Marolf | Donald Marolf | Spacetime Embedding Diagrams for Black Holes | 22 pages, 21 figures, RevTex. To be submitted to the American Journal
of Physics. Experts will wish only to skim appendix A and to look at the
pictures. Suggested Maple code is now compatible with MapleV4r5 | Gen.Rel.Grav. 31 (1999) 919-944 | 10.1023/A:1026646507201 | SU-GP-98/6-1 | gr-qc | null | We show that the 1+1 dimensional reduction (i.e., the radial plane) of the
Kruskal black hole can be embedded in 2+1 Minkowski spacetime and discuss how
features of this spacetime can be seen from the embedding diagram. The purpose
of this work is educational: The associated embedding diagrams may be useful
for expla... | [
{
"created": "Tue, 30 Jun 1998 23:55:41 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Jul 1998 00:02:00 GMT",
"version": "v2"
},
{
"created": "Wed, 8 Jul 1998 19:11:41 GMT",
"version": "v3"
}
] | 2015-06-25 | [
[
"Marolf",
"Donald",
""
]
] | We show that the 1+1 dimensional reduction (i.e., the radial plane) of the Kruskal black hole can be embedded in 2+1 Minkowski spacetime and discuss how features of this spacetime can be seen from the embedding diagram. The purpose of this work is educational: The associated embedding diagrams may be useful for explain... |
2307.01343 | Yufeng Luo | Yufeng Luo, Qian Zhang, Roland Haas, Zachariah B. Etienne, Gabrielle
Allen | HPC-driven computational reproducibility in numerical relativity codes:
A use case study with IllinoisGRMHD | 23 pages, 6 figures, accepted to Classical and Quantum Gravity | null | 10.1088/1361-6382/ad13c5 | null | gr-qc cs.CE physics.comp-ph | http://creativecommons.org/licenses/by-nc-nd/4.0/ | Reproducibility of results is a cornerstone of the scientific method.
Scientific computing encounters two challenges when aiming for this goal.
Firstly, reproducibility should not depend on details of the runtime
environment, such as the compiler version or computing environment, so results
are verifiable by third-pa... | [
{
"created": "Mon, 3 Jul 2023 20:28:48 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Dec 2023 22:55:42 GMT",
"version": "v2"
}
] | 2023-12-12 | [
[
"Luo",
"Yufeng",
""
],
[
"Zhang",
"Qian",
""
],
[
"Haas",
"Roland",
""
],
[
"Etienne",
"Zachariah B.",
""
],
[
"Allen",
"Gabrielle",
""
]
] | Reproducibility of results is a cornerstone of the scientific method. Scientific computing encounters two challenges when aiming for this goal. Firstly, reproducibility should not depend on details of the runtime environment, such as the compiler version or computing environment, so results are verifiable by third-part... |
2102.04744 | Jibitesh Dutta | Wompherdeiki Khyllep and Jibitesh Dutta | Cosmological dynamics and bifurcation analysis of the general
non-minimally coupled scalar field models | 17 pages and 14 figs | Eur. Phys. J. C 81, 774 (2021) | 10.1140/epjc/s10052-021-09559-x | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Non-minimally coupled scalar field models are well-known for providing
interesting cosmological features. These include a late time dark energy
behavior, a phantom dark energy evolution without singularity, an early time
inflationary universe, scaling solutions, convergence to the standard
$\Lambda$CDM, etc. While th... | [
{
"created": "Tue, 9 Feb 2021 10:18:05 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Sep 2021 08:43:55 GMT",
"version": "v2"
}
] | 2021-09-03 | [
[
"Khyllep",
"Wompherdeiki",
""
],
[
"Dutta",
"Jibitesh",
""
]
] | Non-minimally coupled scalar field models are well-known for providing interesting cosmological features. These include a late time dark energy behavior, a phantom dark energy evolution without singularity, an early time inflationary universe, scaling solutions, convergence to the standard $\Lambda$CDM, etc. While the ... |
gr-qc/9801034 | Yousuke Itoh | T. Futamase, M. Hotta and Y. Itoh | Black Holes and Two-Dimensional Dilaton Gravity | 12 pages, LaTeX, Phys. Rev. D (in press) | Phys.Rev.D57:1129-1135,1998 | 10.1103/PhysRevD.57.1129 | TU-529 | gr-qc | null | We study the conditions for 2-dimensional dilaton gravity models to have
dynamical formation of black holes and construct all such models. Furthermore
we present a parametric representation of the general solutions of the black
holes.
| [
{
"created": "Mon, 12 Jan 1998 05:30:32 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Futamase",
"T.",
""
],
[
"Hotta",
"M.",
""
],
[
"Itoh",
"Y.",
""
]
] | We study the conditions for 2-dimensional dilaton gravity models to have dynamical formation of black holes and construct all such models. Furthermore we present a parametric representation of the general solutions of the black holes. |
1704.08116 | T. Damour | Thibault Damour and Philippe Spindel | Quantum Supersymmetric Cosmological Billiards and their Hidden Kac-Moody
Structure | 35 pages, 1 figure | Phys. Rev. D 95, 126011 (2017) | 10.1103/PhysRevD.95.126011 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the quantum fermionic billiard defined by the dynamics of a
quantized supersymmetric squashed three-sphere (Bianchi IX cosmological model
within D=4 simple supergravity). The quantization of the homogeneous gravitino
field leads to a 64-dimensional fermionic Hilbert space. We focus on the 15-
and 20-dimensio... | [
{
"created": "Wed, 26 Apr 2017 13:46:21 GMT",
"version": "v1"
}
] | 2017-07-05 | [
[
"Damour",
"Thibault",
""
],
[
"Spindel",
"Philippe",
""
]
] | We study the quantum fermionic billiard defined by the dynamics of a quantized supersymmetric squashed three-sphere (Bianchi IX cosmological model within D=4 simple supergravity). The quantization of the homogeneous gravitino field leads to a 64-dimensional fermionic Hilbert space. We focus on the 15- and 20-dimensiona... |
1811.00385 | Javier Faba | Javier Faba Garc\'ia, Carlos Sab\'in | Dirac equation in exotic spacetimes | 7 pages, 3 figures | Phys. Rev. D 99, 025008 (2019) | 10.1103/PhysRevD.99.025008 | null | gr-qc quant-ph | http://creativecommons.org/licenses/by/4.0/ | We find solutions of the Dirac equation in curved spacetime. In particular,
we consider 1+1 dimensional sections of several exotic metrics: the Alcubierre
metric, which describes a scenario that allows faster-than-light (FTL)
velocity; the G\"odel metric, that describes a universe containing closed
timelike curves (C... | [
{
"created": "Tue, 30 Oct 2018 18:23:54 GMT",
"version": "v1"
},
{
"created": "Sun, 11 Nov 2018 15:09:09 GMT",
"version": "v2"
},
{
"created": "Tue, 15 Jan 2019 13:36:57 GMT",
"version": "v3"
}
] | 2019-01-16 | [
[
"García",
"Javier Faba",
""
],
[
"Sabín",
"Carlos",
""
]
] | We find solutions of the Dirac equation in curved spacetime. In particular, we consider 1+1 dimensional sections of several exotic metrics: the Alcubierre metric, which describes a scenario that allows faster-than-light (FTL) velocity; the G\"odel metric, that describes a universe containing closed timelike curves (CTC... |
gr-qc/0104068 | Merced Montesinos | Merced Montesinos | Self-dual gravity with topological terms | LaTeX file, no figures, 8 pages. Accepted for publication in Class.
Quantum Grav | Class.Quant.Grav. 18 (2001) 1847-1852 | 10.1088/0264-9381/18/10/303 | null | gr-qc hep-th | null | The canonical analysis of the (anti-) self-dual action for gravity
supplemented with the (anti-) self-dual Pontrjagin term is carried out. The
effect of the topological term is to add a `magnetic' term to the original
momentum variable associated with the self-dual action leaving the Ashtekar
connection unmodified. I... | [
{
"created": "Mon, 23 Apr 2001 01:49:26 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Montesinos",
"Merced",
""
]
] | The canonical analysis of the (anti-) self-dual action for gravity supplemented with the (anti-) self-dual Pontrjagin term is carried out. The effect of the topological term is to add a `magnetic' term to the original momentum variable associated with the self-dual action leaving the Ashtekar connection unmodified. In ... |
1108.3443 | Xin Li | Xin Li and Zhe Chang | Gravitational deflection of light in Rindler-type potential as a
possible resolution to the observations of Bullet Cluster 1E0657-558 | 11 pages | null | 10.1088/0253-6102/57/4/16 | null | gr-qc | http://creativecommons.org/licenses/by/3.0/ | The surface density $\Sigma$-map and the convergence $\kappa$-map of Bullet
Cluster 1E0657-558 show that the center of baryonic matters separates from the
center of gravitational force, and the distribution of gravitational force do
not possess spherical symmetry. This hints that a modified gravity with
difference to... | [
{
"created": "Wed, 17 Aug 2011 10:48:33 GMT",
"version": "v1"
}
] | 2015-05-30 | [
[
"Li",
"Xin",
""
],
[
"Chang",
"Zhe",
""
]
] | The surface density $\Sigma$-map and the convergence $\kappa$-map of Bullet Cluster 1E0657-558 show that the center of baryonic matters separates from the center of gravitational force, and the distribution of gravitational force do not possess spherical symmetry. This hints that a modified gravity with difference to N... |
2104.00116 | Sebastian Schuster | Christian Pfeifer (Universit\"at Bremen) and Sebastian Schuster
(Univerzita Karlova) | Static spherically symmetric black holes in weak f(T)-gravity | v1: 20 pages, 5 figures; v2: 21 pages, 5 figures, no physics changes,
matches published version | Universe 2021, 7(5), 153 | 10.3390/universe7050153 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | With the advent of gravitational wave astronomy and first pictures of the
"shadow" of the central black hole of our milky way, theoretical analyses of
black holes (and compact objects mimicking them sufficiently closely) have
become more important than ever. The near future promises more and more
detailed information... | [
{
"created": "Wed, 31 Mar 2021 21:03:00 GMT",
"version": "v1"
},
{
"created": "Thu, 20 May 2021 04:58:32 GMT",
"version": "v2"
}
] | 2021-05-21 | [
[
"Pfeifer",
"Christian",
"",
"Universität Bremen"
],
[
"Schuster",
"Sebastian",
"",
"Univerzita Karlova"
]
] | With the advent of gravitational wave astronomy and first pictures of the "shadow" of the central black hole of our milky way, theoretical analyses of black holes (and compact objects mimicking them sufficiently closely) have become more important than ever. The near future promises more and more detailed information a... |
2403.12622 | Soumya Chakrabarti | Soumya Chakrabarti | Phase Transition and Thermodynamic Stability in an Entropy-driven
Universe | 10 pages, 6 figures, comments are welcome | null | null | null | gr-qc hep-th math-ph math.MP nlin.PS | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by the notion that the mathematics of gravity can be reproduced
from a statistical requirement of maximal entropy, we study the consequence of
introducing an entropic source term in the Einstein-Hilbert action. For a
spatially homogeneous cosmological system driven by this entropic source and
enveloped by a... | [
{
"created": "Tue, 19 Mar 2024 10:46:44 GMT",
"version": "v1"
}
] | 2024-03-20 | [
[
"Chakrabarti",
"Soumya",
""
]
] | Motivated by the notion that the mathematics of gravity can be reproduced from a statistical requirement of maximal entropy, we study the consequence of introducing an entropic source term in the Einstein-Hilbert action. For a spatially homogeneous cosmological system driven by this entropic source and enveloped by a t... |
gr-qc/0005042 | Leor Barack | Leor Barack | Self-force on a scalar particle in spherically-symmetric spacetime via
mode-sum regularization: radial trajectories | 28 pages, 2 eps figures. To be published in Phys. Rev. D | Phys.Rev.D62:084027,2000 | 10.1103/PhysRevD.62.084027 | null | gr-qc | null | Recently, we proposed a method for calculating the ``radiation reaction''
self-force exerted on a charged particle moving in a strong field orbit in a
black hole spacetime. In this approach, one first calculates the contribution
to the ``tail'' part of the self force due to each multipole mode of the
particle's self ... | [
{
"created": "Fri, 12 May 2000 15:05:42 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Jul 2000 17:04:16 GMT",
"version": "v2"
}
] | 2010-11-19 | [
[
"Barack",
"Leor",
""
]
] | Recently, we proposed a method for calculating the ``radiation reaction'' self-force exerted on a charged particle moving in a strong field orbit in a black hole spacetime. In this approach, one first calculates the contribution to the ``tail'' part of the self force due to each multipole mode of the particle's self fi... |
2408.07651 | Edgardo Franzin | Edgardo Franzin | Mini boson stars in higher dimensions are radially unstable | 7 pages, 4 figures; accepted in GRG | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Boson stars are self-gravitating solutions made entirely of fundamental
massive bosonic fields. Here we investigate mini boson stars in $D$ non-compact
spacetime dimensions and we show that they are dynamically unstable for $D>4$.
| [
{
"created": "Wed, 14 Aug 2024 16:26:20 GMT",
"version": "v1"
}
] | 2024-08-15 | [
[
"Franzin",
"Edgardo",
""
]
] | Boson stars are self-gravitating solutions made entirely of fundamental massive bosonic fields. Here we investigate mini boson stars in $D$ non-compact spacetime dimensions and we show that they are dynamically unstable for $D>4$. |
2103.08339 | Archana Dixit Dr. | Archana Dixit, Vinod Kumar Bharadwaj, Anirudh Pradhan | Barrow HDE model for Statefinder diagnostic in non-flat FRW universe | 19 pages, 21 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we study a non-flat Friedmann-Robertson-Walker universe filled
with a pressure-less dark matter (DM) and Barrow holographic dark energy (BHDE)
whose IR cutoff is the apparent horizon. Among various DE models, (BHDE) model
shows the dynamical enthusiasm to discuss the universe's transition phase.
Accordin... | [
{
"created": "Fri, 12 Mar 2021 10:47:09 GMT",
"version": "v1"
}
] | 2021-08-02 | [
[
"Dixit",
"Archana",
""
],
[
"Bharadwaj",
"Vinod Kumar",
""
],
[
"Pradhan",
"Anirudh",
""
]
] | In this work we study a non-flat Friedmann-Robertson-Walker universe filled with a pressure-less dark matter (DM) and Barrow holographic dark energy (BHDE) whose IR cutoff is the apparent horizon. Among various DE models, (BHDE) model shows the dynamical enthusiasm to discuss the universe's transition phase. According ... |
gr-qc/9511076 | null | B. L. Hu | Cosmology as `Condensed Matter' Physics | Latex 12 pages. Essay published in 1988 Conference Proceedings
reprinted here with no alteration. References current only up to July 1988 | null | null | umdpp 89-013 | gr-qc cond-mat | null | We note that in general there exist two basic aspects in any branch of
physics, including cosmology - one dealing with the attributes of basic
constituents and forces of nature, the other dealing with how structures arise
from them and how they evolve. Current research in quantum and superstring
cosmology is directed... | [
{
"created": "Tue, 28 Nov 1995 05:41:39 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hu",
"B. L.",
""
]
] | We note that in general there exist two basic aspects in any branch of physics, including cosmology - one dealing with the attributes of basic constituents and forces of nature, the other dealing with how structures arise from them and how they evolve. Current research in quantum and superstring cosmology is directed m... |
1308.5770 | Kourosh Nozari | Kourosh Nozari, Faeze Kiani and Narges Rashidi | Gauss-Bonnet Braneworld Cosmology with Modified Induced Gravity on the
Brane | 22 pages, Accepted for publication in Adv. High Energy Phys | Adv. High Energy Phys. 2013 (2013) 968016, 12 | 10.1155/2013/968016 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the background cosmology for an extension of the DGP gravity with
Gauss-Bonnet term in the bulk and $f(R)$ gravity on the brane. We investigate
implications of this setup on the late-time cosmic history. Within a dynamical
system approach, we study cosmological dynamics of this setup focusing on the
role p... | [
{
"created": "Tue, 27 Aug 2013 07:06:06 GMT",
"version": "v1"
}
] | 2014-01-15 | [
[
"Nozari",
"Kourosh",
""
],
[
"Kiani",
"Faeze",
""
],
[
"Rashidi",
"Narges",
""
]
] | We analyze the background cosmology for an extension of the DGP gravity with Gauss-Bonnet term in the bulk and $f(R)$ gravity on the brane. We investigate implications of this setup on the late-time cosmic history. Within a dynamical system approach, we study cosmological dynamics of this setup focusing on the role pla... |
1001.0949 | Joel Spruck | Joel Spruck (Johns Hopkins University), Yisong Yang (Polytechnic
Institute of New York University) | Charged cosmological dust solutions of the coupled Einstein and Maxwell
equations | null | null | null | null | gr-qc hep-th math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is well known through the work of Majumdar, Papapetrou, Hartle, and
Hawking that the coupled Einstein and Maxwell equations admit a static multiple
blackhole solution representing a balanced equilibrium state of finitely many
point charges. This is a result of the exact cancellation of gravitational
attraction and... | [
{
"created": "Wed, 6 Jan 2010 18:50:29 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Jan 2010 17:11:51 GMT",
"version": "v2"
}
] | 2010-01-28 | [
[
"Spruck",
"Joel",
"",
"Johns Hopkins University"
],
[
"Yang",
"Yisong",
"",
"Polytechnic\n Institute of New York University"
]
] | It is well known through the work of Majumdar, Papapetrou, Hartle, and Hawking that the coupled Einstein and Maxwell equations admit a static multiple blackhole solution representing a balanced equilibrium state of finitely many point charges. This is a result of the exact cancellation of gravitational attraction and e... |
2406.05458 | Fatemeh Sadeghi | Ali Derekeh, Behrouz Mirza, Pouya Heidari, Fatemeh Sadeghi, Reza
Bahani | A class of Taub-NUT metrics in the presence of a scalar field | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive a class of Taub-NUT metrics in the presence of a scalar field (TNS)
by applying the Ehlers transformation on the exact solutions that was recently
introduced in arXiv: 2307.09328 and arXiv: 2307.13588. Furthermore, we
investigate the effective potential, geodesics, topological charge, and
quasinormal modes ... | [
{
"created": "Sat, 8 Jun 2024 12:35:32 GMT",
"version": "v1"
}
] | 2024-06-11 | [
[
"Derekeh",
"Ali",
""
],
[
"Mirza",
"Behrouz",
""
],
[
"Heidari",
"Pouya",
""
],
[
"Sadeghi",
"Fatemeh",
""
],
[
"Bahani",
"Reza",
""
]
] | We derive a class of Taub-NUT metrics in the presence of a scalar field (TNS) by applying the Ehlers transformation on the exact solutions that was recently introduced in arXiv: 2307.09328 and arXiv: 2307.13588. Furthermore, we investigate the effective potential, geodesics, topological charge, and quasinormal modes (Q... |
0805.1972 | John T. Whelan | John T. Whelan, Reinhard Prix, and Deepak Khurana | Improved search for galactic white dwarf binaries in Mock LISA Data
Challenge 1B using an F-statistic template bank | 11 pages, 4 included figures, submitted to Classical and Quantum
Gravity for GWDAW12 proceedings | null | 10.1088/0264-9381/25/18/184029 | LIGO-P080037-00-Z | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report on our F-statistic search for white-dwarf binary signals in the
Mock LISA Data Challenge 1B (MLDC1B). We focus in particular on the
improvements in our search pipeline since MLDC1, namely refinements in the
search pipeline and the use of a more accurate detector response (rigid
adiabatic approximation). The... | [
{
"created": "Wed, 14 May 2008 06:00:16 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Jun 2008 14:06:27 GMT",
"version": "v2"
}
] | 2009-11-13 | [
[
"Whelan",
"John T.",
""
],
[
"Prix",
"Reinhard",
""
],
[
"Khurana",
"Deepak",
""
]
] | We report on our F-statistic search for white-dwarf binary signals in the Mock LISA Data Challenge 1B (MLDC1B). We focus in particular on the improvements in our search pipeline since MLDC1, namely refinements in the search pipeline and the use of a more accurate detector response (rigid adiabatic approximation). The s... |
1508.04677 | Bijan Saha Dr. | Bijan Saha and Victor S. Rikhvitsky | Nonlinear Spinor Fields in LRS Bianchi type-I spacetime: Theory and
observation | 10 pages 7 figures. arXiv admin note: text overlap with
arXiv:1507.06236 | Gravitation and Cosmology, Vol. 23, PP. 329 - 336, 2017 | 10.1134/S0202289317040193 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within the scope of a LRS Bianchi type-I cosmological model we study the role
of the nonlinear spinor field in the evolution of the Universe. In doing so we
consider a polynomial type of nonlinearity that describes different stages of
the evolution. Finally we also use the observational data to fix the problem
parame... | [
{
"created": "Wed, 19 Aug 2015 15:17:29 GMT",
"version": "v1"
}
] | 2017-11-02 | [
[
"Saha",
"Bijan",
""
],
[
"Rikhvitsky",
"Victor S.",
""
]
] | Within the scope of a LRS Bianchi type-I cosmological model we study the role of the nonlinear spinor field in the evolution of the Universe. In doing so we consider a polynomial type of nonlinearity that describes different stages of the evolution. Finally we also use the observational data to fix the problem paramete... |
2107.04889 | Reinaldo Gleiser | Reinaldo J. Gleiser | The Linet-Tian metrics are a restricted set of Krasi\'nski's solutions
of Einstein's field equations for a rotating perfect fluid | 7 pages, No figures | null | 10.1088/1361-6382/ac33be | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this note we show that the Linet-Tian family of solutions of the vacuum
Einstein equations with a cosmological constant are a restricted set of the
solutions of the Einstein field equations for a rotating perfect fluid
previously found by A. Krasi\'nski.
| [
{
"created": "Sat, 10 Jul 2021 18:52:15 GMT",
"version": "v1"
}
] | 2021-12-08 | [
[
"Gleiser",
"Reinaldo J.",
""
]
] | In this note we show that the Linet-Tian family of solutions of the vacuum Einstein equations with a cosmological constant are a restricted set of the solutions of the Einstein field equations for a rotating perfect fluid previously found by A. Krasi\'nski. |
0904.3577 | Shintaro Sawayama | Shintaro Sawayama | Solving the Wheeler-DeWitt of Small Universe | 6 page, no figure | null | null | null | gr-qc | http://creativecommons.org/licenses/by/3.0/ | We can solve the Wheeler-DeWitt equation of the small universe enough to
metric becomes diagonal and take a Gaussian normal coordinate. Our previous
works are concerning to this paper. In this paper, we only write how to solve
the Wheeler-DeWitt equation of such universe. Our motivation is simple, that is
to solve th... | [
{
"created": "Thu, 23 Apr 2009 00:04:12 GMT",
"version": "v1"
}
] | 2009-04-24 | [
[
"Sawayama",
"Shintaro",
""
]
] | We can solve the Wheeler-DeWitt equation of the small universe enough to metric becomes diagonal and take a Gaussian normal coordinate. Our previous works are concerning to this paper. In this paper, we only write how to solve the Wheeler-DeWitt equation of such universe. Our motivation is simple, that is to solve the ... |
2008.04805 | Marek Li\v{s}ka | Ana Alonso-Serrano and Marek Li\v{s}ka | New perspective on thermodynamics of spacetime: The emergence of
unimodular gravity and the equivalence of entropies | 19 pages, 1 figure Version accepted in PRD. Few typos corrected and
some references added | Phys. Rev. D 102, 104056 (2020) | 10.1103/PhysRevD.102.104056 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a novel derivation of Einstein equations from the balance between
Clausius entropy crossing the boundary of a local causal diamond and
entanglement entropy associated with its horizon. Comparing this derivation
with the entanglement equilibrium approach developed by Jacobson, we are able
to argue for the e... | [
{
"created": "Tue, 11 Aug 2020 16:01:21 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Nov 2020 12:16:12 GMT",
"version": "v2"
}
] | 2020-11-25 | [
[
"Alonso-Serrano",
"Ana",
""
],
[
"Liška",
"Marek",
""
]
] | We present a novel derivation of Einstein equations from the balance between Clausius entropy crossing the boundary of a local causal diamond and entanglement entropy associated with its horizon. Comparing this derivation with the entanglement equilibrium approach developed by Jacobson, we are able to argue for the equ... |
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